If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. 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. At the same time, you should also make sure that you are being sexually aroused, as Viagra itself is not going to give you an erection. Make sure that you do not try to self-treat for erectile dysfunction without help from your doctor. Viagra Connect is not intended for women or children, and cannot be taken by anyone who has problems with their heart or blood pressure. Using sildenafil, the active ingredient in Viagra Connect, men can improve blood flow to the penis with the help of sexual stimulation.Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult . Viagra is available as the generic drug sildenafil. A generic drug is considered as safe and effective as the original drug. And generics tend to cost less than . Sign up for a Savings Card and, if eligible, you may save 50% on up to 12 prescriptions of brand-name VIAGRA per year.* * Terms and conditions apply. Check Your Pills.