Do not mix the liquid with other medications or add anything to flavor the medication. Common side effects include headaches, dizziness, flushing, nasal congestion, and indigestion. If you select the Active plan, you will receive six free 30 mg Sildenafil chewable tablets for the first month. Safety First: Potential Side Effects and Precautions Like any medication out there, generic Viagra does come with some potential side effects and precautions that should be taken into consideration. Sex Med. Follow-up support: Make sure you can get the help you need if questions or concerns arise after ordering. The mechanism of action for ED pills is simple: They inhibit the PDE5 enzyme which regulates the signals responsible for the smooth muscle tissue.Drug Images What is Viagra? Viagra is a brand-name prescription drug that’s approved to treat erectile dysfunction (ED). With ED, you’re unable to have or maintain an erection. Viagra is. Sildenafil: The Key Ingredient. Sildenafil is the active ingredient in generic Viagra. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. When taken, sildenafil relaxes the muscles and widens the blood vessels in the penis, allowing for increased blood flow. Until stock lasts. Special Offer. US Domestic Shipping Option Is Now Available ?? USPS Priority Mail ( Days) >. Buy generic Viagra online Fast Shipping No Prescription FDA Approved Sildenafil Citrate mg best price $ Sildenafil Viagra India.