diff --git a/src/screens/ActivePickListScreen.test.tsx b/src/screens/ActivePickListScreen.test.tsx
index 07f1b02..8f8b235 100644
--- a/src/screens/ActivePickListScreen.test.tsx
+++ b/src/screens/ActivePickListScreen.test.tsx
@@ -128,12 +128,93 @@ describe('ActivePickListScreen product search', () => {
     );
 
     const combobox = screen.getByRole('combobox');
+    await user.click(combobox);
     await user.type(combobox, 'cola');
 
     expect(await screen.findByRole('option', { name: /cola \(drinks\)/i })).toBeVisible();
     expect(screen.queryByRole('option', { name: /chips \(snacks\)/i })).not.toBeInTheDocument();
   });
 
+  it('omits products already on the pick list from search options', async () => {
+    pickItemsMock.mockReturnValue([
+      {
+        id: 'item-1',
+        pick_list_id: 'list-1',
+        product_id: 'prod-1',
+        quantity: 1,
+        is_carton: false,
+        status: 'pending',
+        created_at: 0,
+        updated_at: 0,
+      },
+    ]);
+
+    const user = userEvent.setup();
+
+    render(
+      <MemoryRouter initialEntries={['/pick-lists/1']}>
+        <Routes>
+          <Route path="/pick-lists/:id" element={<ActivePickListScreen />} />
+        </Routes>
+      </MemoryRouter>,
+    );
+
+    const combobox = screen.getByRole('combobox');
+    await user.click(combobox);
+
+    const listbox = await screen.findByRole('listbox');
+
+    expect(
+      within(listbox).queryByRole('option', { name: /cola \(drinks\)/i }),
+    ).not.toBeInTheDocument();
+    expect(within(listbox).getByRole('option', { name: /chips \(snacks\)/i })).toBeVisible();
+  });
+
+  it('shows a placeholder when no products are available after filtering', () => {
+    pickItemsMock.mockReturnValue([
+      {
+        id: 'item-1',
+        pick_list_id: 'list-1',
+        product_id: 'prod-1',
+        quantity: 1,
+        is_carton: false,
+        status: 'pending',
+        created_at: 0,
+        updated_at: 0,
+      },
+      {
+        id: 'item-2',
+        pick_list_id: 'list-1',
+        product_id: 'prod-2',
+        quantity: 1,
+        is_carton: false,
+        status: 'pending',
+        created_at: 0,
+        updated_at: 0,
+      },
+      {
+        id: 'item-3',
+        pick_list_id: 'list-1',
+        product_id: 'prod-3',
+        quantity: 1,
+        is_carton: false,
+        status: 'pending',
+        created_at: 0,
+        updated_at: 0,
+      },
+    ]);
+
+    render(
+      <MemoryRouter initialEntries={['/pick-lists/1']}>
+        <Routes>
+          <Route path="/pick-lists/:id" element={<ActivePickListScreen />} />
+        </Routes>
+      </MemoryRouter>,
+    );
+
+    expect(screen.getByText(/no available products/i)).toBeVisible();
+  });
+
   it('adds a pick item when a product is selected', async () => {
     const user = userEvent.setup();
 
@@ -275,7 +356,7 @@ describe('ActivePickListScreen product search', () => {
     expect(screen.queryByRole('option', { name: /chips \(snacks\)/i })).not.toBeInTheDocument();
   });
 
-  it('updates an existing pick item when the same packaging is selected', async () => {
+  it('prevents selecting products that are already on the pick list', async () => {
     pickItemsMock.mockReturnValue([
       {
         id: 'item-1',
@@ -301,11 +382,11 @@ describe('ActivePickListScreen product search', () => {
 
     const combobox = screen.getByRole('combobox');
     await user.click(combobox);
+    await user.type(combobox, 'cola');
 
-    const listbox = await screen.findByRole('listbox');
-    await user.click(within(listbox).getByRole('option', { name: /cola \(drinks\)/i }));
-
-    expect(updateMock).toHaveBeenCalledWith('item-1', expect.objectContaining({ quantity: 3 }));
+    expect(screen.queryByRole('option', { name: /cola \(drinks\)/i })).not.toBeInTheDocument();
+    expect(screen.getAllByText(/no available products/i)).not.toHaveLength(0);
+    expect(updateMock).not.toHaveBeenCalled();
     expect(addMock).not.toHaveBeenCalled();
   });
 
diff --git a/src/screens/ActivePickListScreen.tsx b/src/screens/ActivePickListScreen.tsx
index 7c8e571..18e1757 100644
--- a/src/screens/ActivePickListScreen.tsx
+++ b/src/screens/ActivePickListScreen.tsx
@@ -114,15 +114,24 @@ export const ActivePickListScreen = () => {
   const packagingTypeCount = Number(hasCartonItems) + Number(hasUnitItems);
   const singlePackagingType = packagingTypeCount === 1;
 
+  const productIdsInList = useMemo(
+    () => new Set(items.map((item) => item.product_id)),
+    [items],
+  );
+
   const filteredProducts = useMemo(() => {
     const normalizedQuery = query.trim().toLowerCase();
-    if (!normalizedQuery) return categoryFilteredProducts;
+    const availableProducts = categoryFilteredProducts.filter(
+      (product) => !productIdsInList.has(product.id),
+    );
 
-    return categoryFilteredProducts.filter((product) => {
+    if (!normalizedQuery) return availableProducts;
+
+    return availableProducts.filter((product) => {
       const searchableText = `${product.name} ${product.category} ${product.barcode ?? ''}`.toLowerCase();
       return searchableText.includes(normalizedQuery);
     });
-  }, [categoryFilteredProducts, query]);
+  }, [categoryFilteredProducts, productIdsInList, query]);
 
   useEffect(() => {
     if (!selectedProduct) return;
@@ -283,7 +292,7 @@ export const ActivePickListScreen = () => {
               }
             }}
             filterOptions={(options) => options}
-            noOptionsText={query.trim() ? 'No matching products' : 'No products available'}
+            noOptionsText="No available products"
             fullWidth
             renderInput={(params) => (
               <TextField
@@ -320,6 +329,11 @@ export const ActivePickListScreen = () => {
               />
             )}
           />
+          {filteredProducts.length === 0 ? (
+            <Typography variant="body2" color="text.secondary">
+              No available products
+            </Typography>
+          ) : null}
           <Typography variant="caption" color="text.secondary">
             Selecting a product immediately adds it to the pick list.
           </Typography>