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Do not take Cialis if you are also using a nitrate drug for chest pain or heart problems. This includes nitroglycerin, isosorbide dinitrate, and isosorbide mononitrate. Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite ("poppers"). Taking Cialis with a nitrate medicine can cause a sudden and serious decrease in blood pressure.Concomitant Use of Potent Inhibitors of Cytochrome P450 3A4 (CYP3A4) cialis dosage side effects Cialis Interactions

Cimetidine (800 mg), a nonspecific CYP inhibitor, caused a 56% increase in plasma sildenafil concentrations when co-administered with Viagra (50 mg) to healthy volunteers.

In those patients already taking an optimized dose of PDE5 inhibitor, alpha-blocker therapy should be initiated at the lowest dose. Stepwise increase in alpha-blocker dose may be associated with further lowering of blood pressure when taking a PDE5 inhibitor.What happens if I miss a dose? prescription levitra If you have ever had an allergic reaction to a medicine.An erection that won’t go away: If you get an erection lasting more than 4 hours, seek immediate medical help to avoid long-term injury.OakTreeDrugs

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.18. Khandheria BK "Erection, erectile dysfunction: what has heart got to do with it?" Herz 28 (2003): 275-6 cialis without prescription If you notice any symptoms that worry you, check with your doctor.

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Men with untreated ED had relatively low baseline scores for all aspects of sexual function measured (again using a 5-point scale) in the IIEF. Viagra improved these aspects of sexual function: frequency, firmness and maintenance of erections; frequency of orgasm; frequency and level of desire; frequency, satisfaction and enjoyment of intercourse; and overall relationship satisfaction.