The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called .Taking sildenafil alone will not cause an erection. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. The mean steady state volume of distribution Vss for sildenafil is L, indicating distribution into the tissues. Percentage of Patients Reporting an Improvement in Erections. However, if you take sildenafil with a high-fat meal, it will take longer for the medication to start to work.1 day ago · Hims is a telehealth company that provides both prescription and over-the-counter generic and brand-name medications. The brand focuses mainly on five medications, including Viagra, that have. VIAGRA is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to 25 mg, 50 mg, or mg of sildenafil. Tablets are debossed with PFIZER on one side and VGR25, VGR50 or VGR on the other to indicate the dosage strengths. Close. Who may not be able to take sildenafil. Sildenafil is not suitable for some people. To make sure it’s safe for you, speak to your doctor or pharmacist before taking sildenafil if you: have ever had an allergic reaction to sildenafil or any other medicine. have recently had a stroke, heart attack or a heart problem – your doctor should.If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. These include a heart attack, stroke or a serious heart rhythm disorder in the past six months. Viagra had no effect on saquinavir pharmacokinetics. You can take Viagra daily, but because the medication stays in your system for four to six hours, it will not be effective all day. However, eating food, particularly high-fat food, can reduce the effectiveness of Viagra.

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