diff --git a/src/components/medications/__tests__/medication-card-next-due.test.tsx b/src/components/medications/__tests__/medication-card-next-due.test.tsx
index bb4fd48f5..d37d5ae2b 100644
--- a/src/components/medications/__tests__/medication-card-next-due.test.tsx
+++ b/src/components/medications/__tests__/medication-card-next-due.test.tsx
@@ -1,4 +1,4 @@
-import { describe, expect, it, vi } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { renderToStaticMarkup } from "react-dom/server";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 
@@ -52,6 +52,20 @@ const pastWindow = {
   dose: null,
 };
 
+// Pin the clock to a fixed mid-day instant so window-status ("take now"
+// vs "next intake") and relative day labels are deterministic regardless
+// of the CI host clock + timezone. The 01:00–02:00 windows below read as
+// inactive at noon in every timezone; an unpinned run that happened to
+// fall inside that window (e.g. 01:01 CEST) flipped the card to the
+// take-now pill and broke these assertions.
+beforeEach(() => {
+  vi.useFakeTimers({ toFake: ["Date"] });
+  vi.setSystemTime(new Date("2026-06-02T12:00:00Z"));
+});
+afterEach(() => {
+  vi.useRealTimers();
+});
+
 describe("<MedicationCard> — next-due reads from server nextDueAt", () => {
   it("renders the server nextDueAt date for a rolling medication, not a today/tomorrow walker value", () => {
     // Rolling cadence: server anchors the next dose 35 days out. The
@@ -152,17 +166,9 @@ describe("<MedicationCard> — next-due reads from server nextDueAt", () => {
   it("renders the day label for a single-time daysOfWeek medication due tomorrow", () => {
     // A daily / weekly medication whose server next-due is tomorrow
     // still renders the relative "tomorrow" label — proving the ordinary
-    // single-time path keeps working.
-    //
-    // Pin the clock to a midday UTC instant and express `due` as a fixed
-    // UTC instant ~20h later: it lands on the next calendar day in every
-    // timezone the card might label in (UTC and the Berlin default alike),
-    // so the relative label is deterministic regardless of the CI host
-    // clock / timezone (the late-UTC run made an unpinned "tomorrow" read
-    // as "today" in the Berlin frame).
-    vi.useFakeTimers({ toFake: ["Date"] });
-    try {
-    vi.setSystemTime(new Date("2026-06-02T12:00:00Z"));
+    // single-time path keeps working. `due` is a fixed UTC instant ~20h
+    // after the pinned clock, so it lands on the next calendar day in both
+    // UTC and the Berlin default — the relative label is deterministic.
     const now = new Date();
     const due = new Date(now);
     due.setUTCDate(due.getUTCDate() + 1);
@@ -208,8 +214,5 @@ describe("<MedicationCard> — next-due reads from server nextDueAt", () => {
     expect(html).toContain("Next intake:");
     // Relative day label from the server instant (capitalised "Tomorrow").
     expect(html).toContain("Tomorrow,");
-    } finally {
-      vi.useRealTimers();
-    }
   });
 });
diff --git a/src/components/medications/__tests__/medication-card-symmetry.test.tsx b/src/components/medications/__tests__/medication-card-symmetry.test.tsx
index 8085c0cb7..d6d2627fe 100644
--- a/src/components/medications/__tests__/medication-card-symmetry.test.tsx
+++ b/src/components/medications/__tests__/medication-card-symmetry.test.tsx
@@ -1,4 +1,4 @@
-import { describe, expect, it } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { renderToStaticMarkup } from "react-dom/server";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 
@@ -127,6 +127,20 @@ const mounjaro: Glp1Medication = {
   ],
 };
 
+// Pin the clock to a fixed mid-day instant so window-status is
+// deterministic: the all-day window (00:00–23:59) reads active (the
+// take-now pill) and the 01:00–02:00 window reads inactive (the upcoming
+// "next intake" line that carries the purple dose accent), in every
+// timezone. An unpinned run that fell inside 01:00–02:00 (e.g. 01:01 CEST)
+// flipped the accent test's card to the take-now pill.
+beforeEach(() => {
+  vi.useFakeTimers({ toFake: ["Date"] });
+  vi.setSystemTime(new Date("2026-06-02T12:00:00Z"));
+});
+afterEach(() => {
+  vi.useRealTimers();
+});
+
 describe("medication card symmetry — Ramipril vs Mounjaro", () => {
   it("both cards collapse the header actions into a single kebab + navigable header link", () => {
     const client = makeClient();