Other nizoral medical problems: The presence of other medical problems may affect the use of sildenafil. Sildenafil nizoral helps by increasing the supply of blood to the lungs and reducing the workload of the nizoral heart. It is not known if the medicine is safe for use in these patients nizoral Liver problems severe: Chance of problems occurring may be increased. Priapism history of: Although sildenafil nizoral does not cause priapism erection lasting longer than 6 hours, patients with these conditions have an nizoral increased risk of priapism and it could occur while using sildenafil Pulmonary veno-occlusive disease high blood nizoral pressure in the blood vessels of the lungs: May make heart problems worse in patients with nizoral this serious condition Retinitis pigmentosa: Chance of problems occurring may be increased. This is a nizoral decision you and your doctor will make. Abnormal penis, including curved penis and birth defects nizoral of the penis: Chance of problems occurring may be increased Allergies: Tell your doctor if you nizoral have ever had any unusual or allergic reaction to sildenafil. For sildenafil, the following should nizoral be considered: Heart attack, history of within the last 6 months or Heart or blood disease: nizoral Sexual activity increases the heart rate and blood flow and can increase the chance of problems nizoral occurring for some patients who use any type of medicine, including sildenafil, that increases sexual ability nizoral However, sildenafil has not been shown to cause birth defects or other problems in animal studies. nizoral Pregnancy: Sildenafil is not indicated for use in women. Alpha-blockers medicine for high blood nizoral pressure: Sildenafil when taken together with an alpha-blocker medicine may cause very low blood pressure. nizoral Abnormal penis, including curved penis and birth defects of the penis: Chance of problems occurring may nizoral be increased Allergies: Tell your doctor if you have ever had any unusual or allergic reaction nizoral to sildenafil. Alpha-blockers medicine for high blood pressure: Sildenafil when taken together with an alpha-blocker nizoral medicine may cause very low blood pressure. Alpha-blockers medicine for high blood pressure: Sildenafil when nizoral taken together with an alpha-blocker medicine may cause very low blood pressure. Priapism history of: nizoral Although sildenafil does not cause priapism erection lasting longer than 6 hours, patients with these conditions have an increased risk of priapism and it could occur while using sildenafil Pulmonary veno-occlusive disease nizoral high blood pressure in the blood vessels of the lungs: May make heart problems worse in nizoral patients with this serious condition Retinitis pigmentosa: Chance of problems occurring may be increased. Other nizoral medicines: Although certain medicines should not be used together at all, in other cases two different nizoral medicines may be used together even if an interaction might occur. Other medical problems: The nizoral presence of other medical problems may affect the use of sildenafil. It is not known nizoral if the medicine is safe for use in these patients Liver problems severe: Chance of problems nizoral occurring may be increased.