Recent heart or blood vessel problems. Your doctor may adjust your dose if needed. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. This medication is taken with or without food an hour before sex. The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. This medicine also works best when you take it an hour before sex on an empty stomach.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is . AdSay Goodbye to Performance Anxiety and Hello to Improved Sexual Stamina! Trust Our Unbiased Reviews and Improve Your Sexual Health in Confidence!Top Brands Voted By Men · Over 20 Years Online · Honest & Unbiased Reviews.  · Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. You may take it up to 4 hours before sexual activity. Do not take Viagra more than once per day. Shake the oral suspension (liquid) before you measure a dose. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).