To use the oral liquid: Shake the bottle well for at least 10 seconds before each use. This medicine has been approved in the United States to treat premenopausal females who have low sexual desire. This medicine usually begins to work for erectile dysfunction within 30 minutes after taking it. The most common side effects are headaches, feeling sick, indigestion and dizziness. Sildenafil may cause side effects.The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer. Discover Viagra Connect online at Superdrug. Shop the latest trends, offers and collect Health & Beauty points. Free standard delivery Order and Collect. K+ visitors in the past month.