How can this medicine affect other medicines?

It is important to tell your doctor or pharmacist what medicines you are already taking, including those bought without a prescription and herbal medicines, before you start treatment with this medicine. Similarly, check with your doctor or pharmacist before taking any new medicines while taking this one, to ensure that the combination is safe.

If terazosin is taken with other medicines that reduce blood pressure, either as a treatment for high blood pressure (antihypertensives), or as a side effect, there may be an enhanced blood pressure lowering effect. This might make you feel dizzy, particularly with the first dose of terazosin. If you do feel dizzy, you should lie down until the symptoms pass. If any dizziness persists you should let your doctor know, as your medicine doses may need adjusting. Other medicines that can reduce blood pressure include the following:

- ACE inhibitors, eg enalapril, captopril

- other alpha blockers, eg tamsulosin, doxazosin

- angiotensin II receptor antagonists, eg losartan

- antipsychotic medicines

- baclofen

- benzodiazepines, eg temazepam

- beta-blockers, eg propranolol

- calcium channel blockers, eg diltiazem, verapamil, nifedipine

- diuretics, eg furosemide, bendroflumethiazide

- levodopa

- MAOI antidepressants, eg phenelzine

- nitrates, eg glyceryl trinitrate, isosorbide mononitrate

- phosphodiesterase type 5 inhibitors for impotence, eg sildenafil, vardenafil, tadalafil.

Other medicines containing the same active ingredient

Terazosin tablets are also available without a brand name, ie as the generic medicine.