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Consider a starting dose of 25 mg in patients treated with strong CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, or saquinavir) or erythromycin. Clinical data have shown that co-administration with saquinavir or erythromycin increased plasma levels of sildenafil by about 3 fold [see Drug Interactions (7.4) and Clinical Pharmacology (12.3)].

The use of Viagra offers no protection against sexually transmitted diseases. Counseling of patients about the protective measures necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), may be considered [see Warnings and Precautions (5.9)].If you are having an operation or dental treatment, tell the person carrying out the treatment which medicines you are taking. cialis and blood pressure a Treatment duration in Study F was 6 months Ketoconazole 200 mg/day or itraconazole 200 mg/day: Vardenafil dosage not to exceed 5 mg/dayViagra can decrease blood flow to the optic nerve of the eye, causing sudden vision loss. This has occurred in a small number of people taking sildenafil, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoked or were over 50 years old. It is not clear whether sildenafil is the actual cause of vision loss.This medication works by blocking the chemical PDE5. This chemical is responsible for the blockage of blood to flow through the penis - causing the muscles in the penis to constrict. As PDE5 is blocked, the blood is then allowed to stay longer in the penis, causing it to maintain an erection. The more blood flowing in the penis means erection can be achieved.

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Patients using Cialis may not be on a dose schedule, so simply take it as needed.

Do not take Cialis if you take medicines called guanylate cyclase stimulators which include: buy cialis online canada Swallow one tablet whole with a full glass of water.Levitra Drug Description

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