diff --git a/src/app/api/medications/[id]/glp1/route.ts b/src/app/api/medications/[id]/glp1/route.ts
new file mode 100644
index 000000000..d213f416d
--- /dev/null
+++ b/src/app/api/medications/[id]/glp1/route.ts
@@ -0,0 +1,172 @@
+/**
+ * v1.4.25 W4d — GLP-1 medication details endpoint.
+ *
+ * Returns per-medication extras the GLP-1 card variant + the dashboard
+ * tile + the doctor-report PDF section read: chronological dose-change
+ * history, the last 12 injection events (with optional site
+ * rotation data), and the running pen-inventory math. The base
+ * /api/medications/[id] GET is unchanged so v1.4.24 consumers keep
+ * working untouched.
+ */
+
+import { prisma } from "@/lib/db";
+import { apiHandler, requireAuth } from "@/lib/api-handler";
+import { apiError, apiSuccess } from "@/lib/api-response";
+import { NextRequest } from "next/server";
+
+type RouteParams = { params: Promise<{ id: string }> };
+
+const LOW_STOCK_DOSE_THRESHOLD = 4;
+
+export const GET = apiHandler(
+  async (_request: NextRequest, { params }: RouteParams) => {
+    const { user } = await requireAuth();
+    const { id } = await params;
+
+    const medication = await prisma.medication.findUnique({
+      where: { id },
+      include: {
+        doseChanges: { orderBy: { effectiveFrom: "asc" } },
+        inventoryEvents: { orderBy: { occurredAt: "asc" } },
+        intakeEvents: {
+          where: { takenAt: { not: null } },
+          orderBy: { takenAt: "desc" },
+          take: 12,
+          select: { takenAt: true, injectionSite: true },
+        },
+        schedules: true,
+      },
+    });
+
+    if (!medication || medication.userId !== user.id) {
+      return apiError("Medication not found", 404);
+    }
+
+    // Inventory math: running sum of every inventory event. Negative
+    // when more doses were consumed than purchased — surfaces as a
+    // low-stock warning rather than a hard error so the UI keeps
+    // working when the user backdates an inventory event.
+    let inventory: {
+      pensRemaining: number | null;
+      dosesRemaining: number | null;
+      weeksOfSupply: number | null;
+      lowStock: boolean;
+    } | null = null;
+    if (medication.dosesPerUnit && medication.inventoryEvents.length > 0) {
+      const pens = medication.inventoryEvents.reduce(
+        (sum, ev) => sum + ev.delta,
+        0,
+      );
+      const pensRemaining = Math.max(0, pens);
+      const dosesRemaining = pensRemaining * medication.dosesPerUnit;
+      // Approximate weeks-of-supply assuming weekly cadence (the
+      // canonical GLP-1 case). The Coach snapshot does the same.
+      const weeksOfSupply = dosesRemaining;
+      const lowStock = dosesRemaining < LOW_STOCK_DOSE_THRESHOLD;
+      inventory = {
+        pensRemaining,
+        dosesRemaining,
+        weeksOfSupply,
+        lowStock,
+      };
+    }
+
+    return apiSuccess({
+      doseChanges: medication.doseChanges.map((dc) => ({
+        id: dc.id,
+        effectiveFrom: dc.effectiveFrom.toISOString(),
+        doseValue: dc.doseValue,
+        doseUnit: dc.doseUnit,
+        note: dc.note,
+      })),
+      recentIntakes: medication.intakeEvents.map((iv) => ({
+        takenAt: iv.takenAt ? iv.takenAt.toISOString() : null,
+        injectionSite: iv.injectionSite,
+      })),
+      inventory,
+    });
+  },
+);
+
+const doseChangeSchema = {
+  effectiveFrom: "string",
+  doseValue: "number",
+  doseUnit: "string",
+  note: "string?",
+} as const;
+
+const inventorySchema = {
+  delta: "number",
+  reason: "string",
+} as const;
+
+void doseChangeSchema;
+void inventorySchema;
+
+interface DoseChangeBody {
+  effectiveFrom?: string;
+  doseValue?: number;
+  doseUnit?: string;
+  note?: string | null;
+}
+
+interface InventoryBody {
+  delta?: number;
+  reason?: string;
+}
+
+interface Glp1PostBody {
+  doseChange?: DoseChangeBody;
+  inventory?: InventoryBody;
+}
+
+/**
+ * POST creates a new dose change OR inventory event (the body picks
+ * one — caller specifies which). Convenience endpoint so the
+ * medication-card disclosure can write rows without dispatching to
+ * /api/medications/[id]/dose-change + /api/medications/[id]/inventory
+ * separately for the v1.4.25 cut.
+ */
+export const POST = apiHandler(
+  async (request: NextRequest, { params }: RouteParams) => {
+    const { user } = await requireAuth();
+    const { id } = await params;
+    const medication = await prisma.medication.findUnique({ where: { id } });
+    if (!medication || medication.userId !== user.id) {
+      return apiError("Medication not found", 404);
+    }
+
+    const body = (await request.json().catch(() => null)) as Glp1PostBody | null;
+    if (!body) return apiError("Invalid body", 400);
+
+    if (body.doseChange) {
+      const { effectiveFrom, doseValue, doseUnit, note } = body.doseChange;
+      if (!effectiveFrom || typeof doseValue !== "number" || !doseUnit) {
+        return apiError("doseChange.effectiveFrom + doseValue + doseUnit required", 422);
+      }
+      const created = await prisma.medicationDoseChange.create({
+        data: {
+          medicationId: id,
+          effectiveFrom: new Date(effectiveFrom),
+          doseValue,
+          doseUnit,
+          note: note ?? null,
+        },
+      });
+      return apiSuccess({ doseChange: created }, 201);
+    }
+
+    if (body.inventory) {
+      const { delta, reason } = body.inventory;
+      if (typeof delta !== "number" || !reason) {
+        return apiError("inventory.delta + reason required", 422);
+      }
+      const created = await prisma.medicationInventoryEvent.create({
+        data: { medicationId: id, delta, reason },
+      });
+      return apiSuccess({ inventory: created }, 201);
+    }
+
+    return apiError("Body must carry doseChange or inventory", 422);
+  },
+);
diff --git a/src/app/medications/page.tsx b/src/app/medications/page.tsx
index cb1a7a2aa..9128f9d43 100644
--- a/src/app/medications/page.tsx
+++ b/src/app/medications/page.tsx
@@ -8,6 +8,7 @@ import { invalidateKeys, medicationDependentKeys } from "@/lib/query-keys";
 import { parseScheduleRecurrence } from "@/lib/medication-schedule";
 import { MedicationForm } from "@/components/medications/medication-form";
 import { MedicationCard } from "@/components/medications/medication-card";
+import { Glp1MedicationCard } from "@/components/medications/glp1-medication-card";
 import { Button } from "@/components/ui/button";
 import { EmptyState } from "@/components/ui/empty-state";
 import { Switch } from "@/components/ui/switch";
@@ -199,13 +200,21 @@ export default function MedicationsPage() {
           {activeMeds.length > 0 && (
             <div className="space-y-3.5">
               <div className="grid gap-4 sm:grid-cols-2">
-                {activeMeds.map((med) => (
-                  <MedicationCard
-                    key={med.id}
-                    medication={med}
-                    onEdit={openEdit}
-                  />
-                ))}
+                {activeMeds.map((med) =>
+                  med.treatmentClass === "GLP1" ? (
+                    <Glp1MedicationCard
+                      key={med.id}
+                      medication={med}
+                      onEdit={openEdit}
+                    />
+                  ) : (
+                    <MedicationCard
+                      key={med.id}
+                      medication={med}
+                      onEdit={openEdit}
+                    />
+                  ),
+                )}
               </div>
             </div>
           )}
@@ -217,13 +226,21 @@ export default function MedicationsPage() {
                 {t("common.inactive")} ({inactiveMeds.length})
               </h2>
               <div className="grid gap-4 sm:grid-cols-2">
-                {inactiveMeds.map((med) => (
-                  <MedicationCard
-                    key={med.id}
-                    medication={med}
-                    onEdit={openEdit}
-                  />
-                ))}
+                {inactiveMeds.map((med) =>
+                  med.treatmentClass === "GLP1" ? (
+                    <Glp1MedicationCard
+                      key={med.id}
+                      medication={med}
+                      onEdit={openEdit}
+                    />
+                  ) : (
+                    <MedicationCard
+                      key={med.id}
+                      medication={med}
+                      onEdit={openEdit}
+                    />
+                  ),
+                )}
               </div>
             </div>
           )}
diff --git a/src/components/medications/glp1-medication-card.tsx b/src/components/medications/glp1-medication-card.tsx
new file mode 100644
index 000000000..acc49476e
--- /dev/null
+++ b/src/components/medications/glp1-medication-card.tsx
@@ -0,0 +1,490 @@
+"use client";
+
+import { useState } from "react";
+import { useQuery, useQueryClient } from "@tanstack/react-query";
+import Link from "next/link";
+import {
+  Check,
+  ChevronDown,
+  Flame,
+  History,
+  Loader2,
+  Pencil,
+  SkipForward,
+  Smile,
+  Syringe,
+} from "lucide-react";
+
+import { Badge } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { Progress } from "@/components/ui/progress";
+import { useTranslations, useFormatters } from "@/lib/i18n/context";
+import { invalidateKeys, medicationDependentKeys } from "@/lib/query-keys";
+import { formatDateTime, formatTime } from "@/lib/format";
+import {
+  describeInjectionSite,
+  nextInjectionSite,
+  type InjectionSiteKey,
+} from "@/lib/medications/injection-sites";
+
+/**
+ * v1.4.25 W4d — GLP-1 medication card variant.
+ *
+ * Marc directive 2026-05-14: NO chart on the medication card. The card
+ * stays text-rich (drug name + current dose, last/next injection,
+ * inline dose-history disclosure, injection-site rotation hint, pen
+ * inventory, side-effect quick-log). Chart-only surfaces are the
+ * Dashboard tile + Insights /medikamente sub-page.
+ *
+ * Renders inside the standard medications grid alongside generic
+ * medication cards; visually mirrors `medication-card.tsx` so the page
+ * stays harmonious — same Card shell, same header layout, same
+ * compliance bars, same primary "Taken / Skipped" actions. The
+ * GLP-1-specific rows sit between the dose line and the compliance
+ * bars so the user reads top-down: drug → injection state → adherence.
+ */
+
+interface ScheduleLite {
+  id: string;
+  windowStart: string;
+  windowEnd: string;
+  label: string | null;
+  dose: string | null;
+  daysOfWeek: string | null;
+}
+
+interface DoseChangeLite {
+  id: string;
+  effectiveFrom: string;
+  doseValue: number;
+  doseUnit: string;
+  note: string | null;
+}
+
+interface IntakeLite {
+  takenAt: string | null;
+  injectionSite: InjectionSiteKey | null;
+}
+
+export interface Glp1Medication {
+  id: string;
+  name: string;
+  dose: string;
+  category: string;
+  treatmentClass?: string;
+  dosesPerUnit?: number | null;
+  active: boolean;
+  notificationsEnabled: boolean;
+  pausedAt: string | null;
+  lastTakenAt: string | null;
+  schedules: ScheduleLite[];
+}
+
+interface ComplianceData {
+  compliance7: { rate: number; streak: number };
+  compliance30: { rate: number };
+}
+
+interface DetailsResponse {
+  doseChanges: DoseChangeLite[];
+  recentIntakes: IntakeLite[];
+  inventory: {
+    pensRemaining: number | null;
+    dosesRemaining: number | null;
+    weeksOfSupply: number | null;
+    lowStock: boolean;
+  } | null;
+}
+
+interface Glp1MedicationCardProps {
+  medication: Glp1Medication;
+  onEdit: (med: Glp1Medication) => void;
+  onLogSideEffect?: (med: Glp1Medication) => void;
+}
+
+const DAY_KEYS = [
+  "medications.daysSun",
+  "medications.daysMon",
+  "medications.daysTue",
+  "medications.daysWed",
+  "medications.daysThu",
+  "medications.daysFri",
+  "medications.daysSat",
+] as const;
+
+function parseDayList(raw: string | null): number[] {
+  if (!raw) return [];
+  return raw
+    .split(",")
+    .map((p) => Number(p.trim()))
+    .filter((n) => Number.isInteger(n) && n >= 0 && n <= 6);
+}
+
+function diffDays(target: Date, from: Date): number {
+  const ms =
+    Date.UTC(target.getFullYear(), target.getMonth(), target.getDate()) -
+    Date.UTC(from.getFullYear(), from.getMonth(), from.getDate());
+  return Math.round(ms / (24 * 60 * 60 * 1000));
+}
+
+function predictNextWeeklyDate(
+  schedule: ScheduleLite | null,
+  lastTakenAt: string | null,
+  now: Date,
+): { date: Date; daysAway: number } | null {
+  if (!schedule) return null;
+  const dow = parseDayList(schedule.daysOfWeek);
+  if (dow.length !== 1) return null;
+  const target = dow[0];
+  const anchor = lastTakenAt ? new Date(lastTakenAt) : now;
+  const cursor = new Date(anchor);
+  cursor.setHours(0, 0, 0, 0);
+  for (let i = 1; i <= 14; i += 1) {
+    cursor.setDate(cursor.getDate() + 1);
+    if (cursor.getDay() === target) {
+      const days = diffDays(cursor, now);
+      return { date: cursor, daysAway: Math.max(0, days) };
+    }
+  }
+  return null;
+}
+
+export function Glp1MedicationCard({
+  medication,
+  onEdit,
+  onLogSideEffect,
+}: Glp1MedicationCardProps) {
+  const queryClient = useQueryClient();
+  const { t, locale } = useTranslations();
+  const fmt = useFormatters();
+  const [intakeLoading, setIntakeLoading] = useState<string | null>(null);
+  const [showHistory, setShowHistory] = useState(false);
+
+  const { data: compliance } = useQuery({
+    queryKey: ["medications", medication.id, "compliance"],
+    queryFn: async () => {
+      const res = await fetch(`/api/medications/${medication.id}/compliance`);
+      if (!res.ok) return null;
+      const json = await res.json();
+      return json.data as ComplianceData;
+    },
+    staleTime: 30 * 1000,
+    enabled: medication.active,
+  });
+
+  // Pull GLP-1-specific extras (dose history + recent injection sites +
+  // pen inventory). Lives behind a dedicated endpoint so the standard
+  // medications grid loads in parallel without paying for it.
+  const { data: details } = useQuery({
+    queryKey: ["medications", medication.id, "glp1-details"],
+    queryFn: async () => {
+      const res = await fetch(`/api/medications/${medication.id}/glp1`);
+      if (!res.ok) return null;
+      const json = await res.json();
+      return json.data as DetailsResponse;
+    },
+    staleTime: 60 * 1000,
+  });
+
+  async function recordIntake(skipped: boolean) {
+    const key = skipped ? "skip" : "take";
+    setIntakeLoading(key);
+    try {
+      const res = await fetch(`/api/medications/${medication.id}/intake`, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ skipped }),
+      });
+      if (res.ok) {
+        await invalidateKeys(queryClient, medicationDependentKeys);
+      }
+    } finally {
+      setIntakeLoading(null);
+    }
+  }
+
+  const schedule = medication.schedules[0] ?? null;
+  const now = new Date();
+  const next = predictNextWeeklyDate(schedule, medication.lastTakenAt, now);
+  const rate7 = compliance?.compliance7?.rate ?? 0;
+  const rate30 = compliance?.compliance30?.rate ?? 0;
+  const streak = compliance?.compliance7?.streak ?? 0;
+
+  const doseChanges = details?.doseChanges ?? [];
+  const recentInjections = details?.recentIntakes ?? [];
+  const lastSite =
+    recentInjections.find((i) => i.injectionSite)?.injectionSite ?? null;
+  const recommendedNextSite = nextInjectionSite(
+    recentInjections.map((r) => r.injectionSite).filter(Boolean) as InjectionSiteKey[],
+  );
+
+  const inventory = details?.inventory ?? null;
+
+  function lastInjectionLabel(): string | null {
+    if (!medication.lastTakenAt) return null;
+    const d = new Date(medication.lastTakenAt);
+    const days = diffDays(d, now);
+    if (days === 0) return `${t("medications.today")}, ${formatTime(medication.lastTakenAt)}`;
+    if (days === -1) return `${t("medications.yesterday")}, ${formatTime(medication.lastTakenAt)}`;
+    return formatDateTime(medication.lastTakenAt);
+  }
+
+  function nextInjectionLabel(): string {
+    if (!next) return "—";
+    if (next.daysAway === 0) return t("medications.glp1NextInjectionToday");
+    if (next.daysAway === 1) return t("medications.glp1NextInjectionTomorrow");
+    const dayName = t(DAY_KEYS[next.date.getDay()]);
+    const dateShort = fmt.dateShort(next.date);
+    return t("medications.glp1NextInjectionDays", {
+      label: `${dayName}, ${dateShort}`,
+      days: next.daysAway,
+    });
+  }
+
+  return (
+    <Card className={medication.active ? "" : "opacity-60"}>
+      <CardHeader className="pb-2.5">
+        <div className="flex items-start justify-between">
+          <div className="space-y-1">
+            <CardTitle className="flex items-center gap-2 text-lg">
+              <Syringe className="text-dracula-purple h-4 w-4 shrink-0" />
+              <span>{medication.name}</span>
+              <span className="text-muted-foreground text-sm font-normal">
+                · {medication.dose}
+              </span>
+            </CardTitle>
+            <div className="text-muted-foreground flex items-center gap-2 text-xs">
+              <Badge variant="outline" className="text-xs">
+                {t("medications.treatmentClassGlp1")}
+              </Badge>
+              {!medication.notificationsEnabled && (
+                <Badge variant="secondary" className="text-xs">
+                  {t("medications.withoutNotification")}
+                </Badge>
+              )}
+              {!medication.active && (
+                <Badge variant="secondary" className="text-xs">
+                  {medication.pausedAt
+                    ? `${t("medications.pausedSince")} ${formatDateTime(medication.pausedAt)}`
+                    : t("medications.inactive")}
+                </Badge>
+              )}
+            </div>
+          </div>
+          <div className="flex items-center gap-0.5">
+            <Button
+              variant="ghost"
+              size="icon"
+              className="min-h-11 min-w-11"
+              asChild
+              aria-label={t("medications.intakeHistory")}
+            >
+              <Link href={`/medications/${medication.id}/history`}>
+                <History className="h-4 w-4" />
+              </Link>
+            </Button>
+            <Button
+              variant="ghost"
+              size="icon"
+              className="min-h-11 min-w-11"
+              onClick={() => onEdit(medication)}
+              aria-label={t("common.edit")}
+            >
+              <Pencil className="h-4 w-4" />
+            </Button>
+          </div>
+        </div>
+      </CardHeader>
+
+      <CardContent className="space-y-3.5">
+        {/* Injection state — last + next */}
+        <div className="space-y-1 text-sm">
+          {medication.lastTakenAt && (
+            <p className="text-muted-foreground">
+              {lastSite
+                ? t("medications.glp1LastInjectionWithSite", {
+                    label: lastInjectionLabel() ?? "—",
+                    site: t(`medications.site${siteSuffix(lastSite)}`),
+                  })
+                : t("medications.glp1LastInjection", {
+                    label: lastInjectionLabel() ?? "—",
+                  })}
+            </p>
+          )}
+          <p className="text-foreground/85">{nextInjectionLabel()}</p>
+        </div>
+
+        {/* Rotation hint — only when we have a last + recommended site
+            different from it. The picker on the dashboard tile owns
+            mode-switching; the card just nudges. */}
+        {lastSite && recommendedNextSite && recommendedNextSite !== lastSite && (
+          <div className="border-border/60 bg-muted/40 rounded-md border px-3 py-2 text-xs">
+            <p className="text-muted-foreground">
+              {t("medications.glp1RotationLast", {
+                site: t(`medications.site${siteSuffix(lastSite)}`),
+              })}
+            </p>
+            <p className="text-foreground/90 font-medium">
+              {t("medications.glp1RotationSuggested", {
+                site: t(`medications.site${siteSuffix(recommendedNextSite)}`),
+              })}
+            </p>
+          </div>
+        )}
+
+        {/* Inventory line — only when dosesPerUnit + at least one
+            inventory event recorded. Low-stock gets a warning badge. */}
+        {inventory && inventory.pensRemaining !== null && (
+          <div className="flex items-center justify-between text-xs">
+            <span className="text-muted-foreground">
+              {t("medications.glp1Inventory", {
+                pens: inventory.pensRemaining,
+                weeks: inventory.weeksOfSupply ?? "—",
+              })}
+            </span>
+            {inventory.lowStock && (
+              <Badge variant="destructive" className="text-[10px]">
+                {t("medications.glp1InventoryLow")}
+              </Badge>
+            )}
+          </div>
+        )}
+
+        {/* Dose-history disclosure — collapsible row. Stays closed by
+            default so the card height matches a generic card on first
+            paint. */}
+        <details
+          className="border-border/60 rounded-md border text-xs"
+          open={showHistory}
+          onToggle={(e) => setShowHistory((e.target as HTMLDetailsElement).open)}
+        >
+          <summary className="text-foreground/85 flex cursor-pointer list-none items-center justify-between px-3 py-2 font-medium">
+            <span>{t("medications.glp1DoseHistory")}</span>
+            <ChevronDown
+              className={`h-3.5 w-3.5 transition-transform ${
+                showHistory ? "rotate-180" : ""
+              }`}
+            />
+          </summary>
+          <div className="border-border/60 space-y-1.5 border-t px-3 py-2">
+            {doseChanges.length === 0 && (
+              <p className="text-muted-foreground">
+                {t("medications.glp1DoseHistoryEmpty")}
+              </p>
+            )}
+            {doseChanges
+              .slice()
+              .reverse()
+              .map((change) => (
+                <div
+                  key={change.id}
+                  className="flex items-baseline justify-between gap-2"
+                >
+                  <span className="font-medium tabular-nums">
+                    {change.doseValue} {change.doseUnit}
+                  </span>
+                  <span className="text-muted-foreground">
+                    {t("medications.glp1DoseSince", {
+                      date: fmt.dateShort(new Date(change.effectiveFrom)),
+                    })}
+                  </span>
+                </div>
+              ))}
+          </div>
+        </details>
+
+        {/* Compliance bars — identical to the generic card so the page
+            grid stays harmonious. */}
+        {medication.active && compliance && (
+          <div className="space-y-2.5">
+            <div className="space-y-1.5">
+              <div className="flex items-center justify-between text-sm">
+                <span className="text-muted-foreground">
+                  {t("medications.compliance7d")}
+                </span>
+                <span className="font-medium">{rate7}%</span>
+              </div>
+              <Progress value={rate7} className="h-2" />
+            </div>
+            <div className="space-y-1.5">
+              <div className="flex items-center justify-between text-sm">
+                <span className="text-muted-foreground">
+                  {t("medications.compliance30d")}
+                </span>
+                <span className="font-medium">{rate30}%</span>
+              </div>
+              <Progress value={rate30} className="h-2" />
+            </div>
+            {streak > 0 && (
+              <div className="flex items-center gap-4 text-xs">
+                <span className="flex items-center gap-1 font-medium text-orange-400">
+                  <Flame className="h-3.5 w-3.5" />
+                  {streak} {t("medications.dayStreak")}
+                </span>
+              </div>
+            )}
+          </div>
+        )}
+
+        {/* Primary actions row — matches the generic card's
+            min-h-11 tap-target rule. The third button opens the
+            side-effect log pre-tagged with the GLP-1 drug name. */}
+        {medication.active && (
+          <div className="flex flex-wrap gap-2">
+            <Button
+              className="min-h-11 flex-1"
+              onClick={() => recordIntake(false)}
+              disabled={!!intakeLoading}
+            >
+              {intakeLoading === "take" ? (
+                <Loader2 className="mr-1 h-4 w-4 animate-spin" />
+              ) : (
+                <Check className="mr-1 h-4 w-4" />
+              )}
+              {t("medications.taken")}
+            </Button>
+            <Button
+              variant="outline"
+              className="min-h-11"
+              onClick={() => recordIntake(true)}
+              disabled={!!intakeLoading}
+            >
+              {intakeLoading === "skip" ? (
+                <Loader2 className="mr-1 h-4 w-4 animate-spin" />
+              ) : (
+                <SkipForward className="mr-1 h-4 w-4" />
+              )}
+              {t("medications.skipped")}
+            </Button>
+            {onLogSideEffect && (
+              <Button
+                variant="ghost"
+                className="min-h-11"
+                onClick={() => onLogSideEffect(medication)}
+              >
+                <Smile className="mr-1 h-4 w-4" />
+                {t("medications.glp1LogSideEffect")}
+              </Button>
+            )}
+          </div>
+        )}
+      </CardContent>
+    </Card>
+  );
+}
+
+/**
+ * Map enum value → i18n suffix.  ABDOMEN_LEFT → "AbdomenLeft" so we can
+ * lookup `medications.siteAbdomenLeft` etc. without a switch table.
+ */
+function siteSuffix(site: InjectionSiteKey): string {
+  return site
+    .toLowerCase()
+    .split("_")
+    .map((part) => part.charAt(0).toUpperCase() + part.slice(1))
+    .join("");
+}
+
+/** Re-export so the parent doesn't need to import describeInjectionSite. */
+export { describeInjectionSite };
diff --git a/src/components/medications/medication-card.tsx b/src/components/medications/medication-card.tsx
index 1ddcd4c1a..b8f8f2045 100644
--- a/src/components/medications/medication-card.tsx
+++ b/src/components/medications/medication-card.tsx
@@ -35,6 +35,14 @@ interface Medication {
   name: string;
   dose: string;
   category: string;
+  /**
+   * v1.4.25 W4d — Prisma treatment-class discriminator. When set to
+   * "GLP1" the parent should render the {@link Glp1MedicationCard}
+   * variant instead of this generic card. The field is optional for
+   * backwards compatibility with mocks.
+   */
+  treatmentClass?: string;
+  dosesPerUnit?: number | null;
   active: boolean;
   notificationsEnabled: boolean;
   pausedAt: string | null;
diff --git a/src/lib/medications/injection-sites.ts b/src/lib/medications/injection-sites.ts
new file mode 100644
index 000000000..29c937fb4
--- /dev/null
+++ b/src/lib/medications/injection-sites.ts
@@ -0,0 +1,112 @@
+/**
+ * v1.4.25 W4d — injection-site rotation logic.
+ *
+ * The 8-zone enum maps to the Prisma `InjectionSite` enum exactly so
+ * the snapshot, the picker, the card variant, and the doctor-report
+ * all speak the same vocabulary. Front-of-body view, mirrored for
+ * left/right per Eli Lilly's Mounjaro PI + Novo Nordisk's
+ * Ozempic/Wegovy PI rotation guidance.
+ */
+
+export const INJECTION_SITE_KEYS = [
+  "ABDOMEN_LEFT",
+  "ABDOMEN_RIGHT",
+  "ABDOMEN_UPPER_LEFT",
+  "ABDOMEN_UPPER_RIGHT",
+  "THIGH_LEFT",
+  "THIGH_RIGHT",
+  "UPPER_ARM_LEFT",
+  "UPPER_ARM_RIGHT",
+] as const;
+
+export type InjectionSiteKey = (typeof INJECTION_SITE_KEYS)[number];
+
+/**
+ * Stylized SVG position for each site (front-of-body view, ~120x300
+ * viewBox). Used by `injection-site-picker.tsx` to render the clickable
+ * dots; tuned to read clearly on a 320px mobile viewport.
+ *
+ * The body outline is a rounded humanoid: head (y≈20), shoulders
+ * (y≈60), torso (y≈70-180), thighs (y≈180-260). Sites sit on the
+ * dominant injection zones — abdomen quadrants centred on (60, 130),
+ * thighs at (40, 215) / (80, 215), upper arms at (20, 80) / (100, 80).
+ */
+export const SITE_COORDS: Record<InjectionSiteKey, { x: number; y: number }> = {
+  ABDOMEN_UPPER_LEFT: { x: 48, y: 110 },
+  ABDOMEN_UPPER_RIGHT: { x: 72, y: 110 },
+  ABDOMEN_LEFT: { x: 48, y: 140 },
+  ABDOMEN_RIGHT: { x: 72, y: 140 },
+  THIGH_LEFT: { x: 42, y: 215 },
+  THIGH_RIGHT: { x: 78, y: 215 },
+  UPPER_ARM_LEFT: { x: 18, y: 82 },
+  UPPER_ARM_RIGHT: { x: 102, y: 82 },
+};
+
+/**
+ * Recommend the next injection site given the recent rotation
+ * history. Strategy: maximise the average Euclidean distance from the
+ * candidate to each of the last N sites (N defaults to 4), tie-break
+ * by least-recently-used (an unseen site beats a stale one).
+ *
+ * Returns `null` only when the input history is empty (no
+ * recommendation to make — the picker shows all sites as available).
+ */
+export function nextInjectionSite(
+  history: ReadonlyArray<InjectionSiteKey>,
+  windowSize = 4,
+): InjectionSiteKey | null {
+  if (history.length === 0) {
+    // First-time user — recommend a sensible default (abdomen left)
+    // rather than null. The card needs SOMETHING to point to.
+    return "ABDOMEN_LEFT";
+  }
+
+  const recent = history.slice(0, windowSize);
+  // Site → most recent index in the recent window (lower = more
+  // recent). Sites missing from the window get a large rank so they
+  // beat any recently-used site in the tie-break.
+  const lastSeenRank = new Map<InjectionSiteKey, number>();
+  for (let i = 0; i < recent.length; i += 1) {
+    if (!lastSeenRank.has(recent[i])) {
+      lastSeenRank.set(recent[i], i);
+    }
+  }
+
+  let bestSite: InjectionSiteKey = INJECTION_SITE_KEYS[0];
+  let bestScore = -Infinity;
+
+  for (const candidate of INJECTION_SITE_KEYS) {
+    if (candidate === recent[0]) continue; // never recommend the most-recent site
+    const candidateCoord = SITE_COORDS[candidate];
+    let dist = 0;
+    for (const used of recent) {
+      const usedCoord = SITE_COORDS[used];
+      const dx = candidateCoord.x - usedCoord.x;
+      const dy = candidateCoord.y - usedCoord.y;
+      dist += Math.sqrt(dx * dx + dy * dy);
+    }
+    // Recency penalty — sites used more recently score lower.
+    const rank = lastSeenRank.get(candidate);
+    const recencyBonus = rank === undefined ? recent.length * 50 : -rank * 10;
+    const score = dist + recencyBonus;
+    if (score > bestScore) {
+      bestScore = score;
+      bestSite = candidate;
+    }
+  }
+
+  return bestSite;
+}
+
+/**
+ * i18n-friendly human-readable label key for a site. Caller passes
+ * it to `t()` to render the localised string.
+ */
+export function describeInjectionSite(site: InjectionSiteKey): string {
+  const suffix = site
+    .toLowerCase()
+    .split("_")
+    .map((part) => part.charAt(0).toUpperCase() + part.slice(1))
+    .join("");
+  return `medications.site${suffix}`;
+}