The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. Privacy: Confirm that your personal data and payment details are confidential. It works for up to 36 hours. You’ll also need to fill out a medical questionnaire with answers about your medical history, current medications, and lifestyle habits. ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup.VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Patients should always ask their doctors for medical advice about adverse events. You are . If you’re holding out for a generic version of branded Viagra, you won’t have to wait much longer. Teva Pharmaceuticals plans to release its generic of the “little blue . Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or .