Tamsulosin hydrochloride is contraindicated in patients with hypersensitivity to it; history of orthostatic hypotension; severe hepatic insufficiency.
As with other alpha1 blockers, a reduction in blood pressure can occur in individual cases during treatment with Tamsulosin, as a result of which, rarely, syncope can occur, at the first signs of orthostatic hypotension (dizziness, weakness) the patient should sit or lie down until the symptoms have disappeared. And they should be cautioned to avoid situations where injury could result (like driving, operating machinery or performing hazardous tasks).
Before therapy with Tamsulosin is initiated the patient should be examined in order to exclude the presence of other conditions which can cause the same symptoms as Benign Prostatic hyperplasia. Digital rectal examination and when the necessary determination of Prostate Specific Antigen (PSA) should be performed before treatment and at regular intervals afterwards.