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Its effect is more potent on PDE5 than on other known phosphodiesterases (10-fold for PDE6, > 80-fold for PDE1, > 700-fold for PDE2, PDE3, PDE4, PDE7, PDE8, PDE9, PDE10, and PDE11). When your doctor prescribes a new medication, be sure to discuss all your prescription medications and over-the-counter drugs, including dietary supplements, vitamins, botanicals, minerals, and herbals, as well as foods you eat. Taking sildenafil with a nitrate medicine can cause a serious decrease in blood pressure, leading to fainting, stroke, or heart attack.

Viagra works by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. Megan Uehara, PharmD Q: Can you take Viagra and take blood pressure medicine at the same time? If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes.

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Other phosphodiesterase inhibitors include Levitra (vardenafil) and Cialis (tadalafil). Remember to take these drugs on an empty stomach with water, so they may work better.

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Gharbia, PharmD Q: What's the problem with taking Viagra occasionally two times in the same day, maybe 12 or so hours apart? A total dose of 40 mg sildenafil was administered by four intravenous infusions.

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If possible, use one pharmacy for all your prescription medications and over-the-counter products. Your doctor will also check you to determine if this drug is working. The antigenic composition of the skeletal muscles is the same with both methods of connection of the tissues defects. In vivo Studies 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. Please see full prescribing information for VIAGRA (25 mg, 50 mg, 100 mg) tablets. Before taking this medicine You should not use Viagra if you are allergic to sildenafil, or: if you take other medicines to treat pulmonary arterial hypertension, such as riociguat (Adempas). if you take nitrates. 5 mg taken at the same time each day and without regard to sexual activity. Viagra relaxes muscles and increases blood flow to particular areas of the body. In clinical studies, Viagra was given to more than 3,000 patients aged 19 to 87 years with erectile dysfunction of different causes.