Pulmonary Hypertension. The best time to take sildenafil is about 1 hour before sexual activity, but you can take the medication any time from 4 hours to 30 minutes before sexual activity. Place the tip of the syringe into you or your child’s mouth and point it towards the cheek. Click here for an email preview. Do not keep outdated medicine or medicine no longer needed. Use the oral syringe provided with your medication to measure and take your dose.VIAGRA can cause your blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not take VIAGRA if you take any other medicines called “nitrates.” Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke. AdLearn the truth about men’s sex pills and how to achieve optimum results naturally. Male UltraCore is the #1 Rated premium sex pill for maximum enhancing test1.rury Leaders · Watch Video · Fully Equipped · Custom Formulation. 1. Avoid taking Viagra with a large meal or high-fat meal. Viagra blood levels peak an hour after you swallow the tablet on an empty stomach. According to Ramin, if you eat a large or high-fat.