However, even when buying prescription drugs for legitimate reasons, such as pain relief, using a medication without a prescription can come with risks, such as developing an addiction or drug overdose. Sildenafil comes as a tablet and suspension liquid to take by mouth. This includes prescription drugs bought through legal and illicit channels. If you are taking sildenafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph. 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. What side effects can this medication cause? The cost of opiates bought on the street will depend on the type of opiate, the strength dosage , and other factors.The recommended dosage of Viagra for erectile dysfunction (ED) is 50 mg, taken as needed about 1 hour before sexual activity. You can take it 30 minutes to 4 hours before sexual activity. And you. The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card. Does Viagra’s average price vary based on which strength I take (25 mg, 50 mg, mg)? It’s possible for Viagra’s cost to vary by a few dollars based on the strength you take.