Inform your doctor of your allergies (food or drugs), medical conditions and medical history before taking this drug, especially of: heart disease (such as congestive heart failure, angina, heart attack in last 6 months), liver disease, certain eye problems (cataracts, glaucoma).
Do not perform activities that require alertness such as driving and using machinery because this drug can make you dizzy.
Before having surgery (including cataract/glaucoma eye surgery), tell your doctor or dentist if you are taking or have ever taken this medication, and about all the other products you use (including prescription drugs, nonprescription drugs, and herbal products).
Older adults may be more sensitive to side effects. For pregnant and nursing (breastfeeding) women, consult your doctor before using this medication.
Before using this drug, tell your doctor of the current medications, products (herbal/nonprescription) that you are taking especially of: other alpha blocker drugs (such as prazosin, tamsulosin), drug to treat erectile dysfunction-ED or pulmonary hypertension (such as sildenafil, tadalafil), azole antifungals (such as itraconazole, ketoconazole), boceprevir, macrolide antibiotics (such as clarithromycin), HIV protease inhibitors (such as lopinavir, ritonavir), among others.