The primary measure in the principal studies was a sexual function questionnaire the International Index of Erectile Function – IIEF administered during a 4-week treatment-free run-in period, at baseline, at follow-up visits, and at the end of double-blind, placebo-controlled, at-home treatment. Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil. It affects the way the medicine works. Your doctor will discuss the best treatment plan for you. Cialis stays in your system for up to 36 hours and may provide support for erections during that entire time. Sildenafil for pulmonary hypertension can also be known by the brand names Revatio and Grandipam.See also: Generic Viagra. Once you settle on a lab, you can begin your research. Some students choose to volunteer in the lab (anywhere from hours per week). Starting in your junior spring you can receive course credit for your lab work by enrolling in Neurobiology About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in test1.ru is also used to treat pulmonary arterial hypertension, a serious heart and lung test1.ru drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but .