DETRUSITOL SR is contraindicated in patients with urinary retention, gastric retention, or uncontrolled narrow-angle glaucoma. DETRUSITOL SR is also contraindicated in patients with known hypersensitivity to the drug or its ingredients, or to fesoterodine fumarate extended-release tablets which, like DETRUSITOL SR, are metabolized to 5-hydroxymethyl tolterodine [see PRECAUTIONS].