Vardenafil usually works for 4 to 5 hours. It might be a while before MED is available at your local pharmacy. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. Sildenafil Viagra. Side effects Side effects of oral ED medicines are often mild. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar.Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or . Viagra vs. over-the-counter products. Many over-the-counter (OTC) products may be advertised to help with ED. Examples of these products include: . An OTC drug will help patients get treatment more quickly. Dr. Pearlman says it can often take months to get an appointment with a healthcare provider who can .

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