Use the oral syringe provided with your medication to measure and take your dose. Take sildenafil as needed before sexual activity. Tell your doctor if any of these symptoms are severe or do not go away: headache. Tell your doctor if sildenafil is not working well or if you are experiencing side effects. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. Patients should always ask their doctors for medical advice about adverse events. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine.Viagra (sildenafil) is a brand-name oral tablet prescribed for erectile dysfunction. The cost of the drug with and without insurance can depend on several factors, such as whether . Sildenafil price As with all medications, the cost of sildenafil can vary. Factors that may affect the price you’ll pay include your treatment plan, your insurance coverage, the form . VIAGRA does not protect against sexually transmitted diseases, including HIV. The most common side effects of VIAGRA: headache; flushing; upset stomach; This Savings Offer is limited to 50% savings off the amount of your co-pay or your out-of-pocket cost, whichever is less, with a maximum savings of $ off each prescription for up to