If you drink a large amount of alcohol more than five glasses of wine or five shots of whiskey while you are taking tadalafil you are more likely to experience certain side effects of tadalafil such as dizziness, headache, fast heartbeat, and low blood pressure. Sildenafil the active ingredient in Viagra remains active for hours, so it requires more careful planning to ensure you experience the effects when you need them. Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. This allows the smooth muscles in the penis to relax and fill with blood. Sexual activity may be a strain on your heart, especially if you have heart disease. Terms and conditions of use. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours.Find your nearest Costco Pharmacy in Los Angeles, California. View store hours, reviews, contact information and prescription savings with GoodRx. We have good news for you: generic Cialis, used to treat erectile dysfunction (ED)and enlarged prostates, just hit pharmacies. Prices for the generic, known as . Store Cialis (Tadalafil) at room temperature (between 15°C and 30°C) and keep it out of the reach and sight of children. Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.