Do not stop taking sildenafil without talking to your doctor. Do not drink grapefruit juice if you’re taking sildenafil Revatio for pulmonary hypertension. And not all online pharmacies have the capability to safely ship medications that need to be temperature-controlled, such as insulin. It’s available in 50 mg, mg, and mg tablets. However, some states require a live video consultation.Viagra is the brand name for sildenafil, a medication for treating erectile dysfunction (ED). BlueChew and Hims offer chewable forms of these medications, which people may find easier to take. If you have these symptoms, stop taking VIAGRA and contact a doctor right away. have or have had heart problems such as a heart attack, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, or heart failure. have low blood pressure, or high blood pressure that is not controlled. Sildenafil tablets for erectile dysfunction come in different strengths ranging from 25mg to mg. The usual dose is 50mg, when you need it. Do not take it more than once a day. The dose can be increased to mg or decreased to 25mg depending on its effect. Take sildenafil up to 4 hours before you want to have sex.