Viagra is the trade name and generic name of sildenafil citrate tablets, and coffee generally does not affect its effectiveness. Sildenafil Citrate Tablet is an erectile dysfunction medication, which belongs to is a western medicine. This product is mainly used for the treatment of erectile dysfunction, coffee has no effect on its action, there is no relevant evidence-based or clinical trials, proving that coffee will affect the efficacy of this product. The medication should be taken on a daily basis in accordance with the doctor’s instructions. Adverse reactions to this product are commonly associated with facial edema, pain, chills, allergic reactions, palpitations (rapid heartbeat, often accompanied by panic), hypotension, vomiting, tongue inflammation, difficulty swallowing, and dry mouth. Contraindicated in patients taking any dosage form of nitrate. This product is not suitable for women, newborns, children. If you need to use this product, you need to have a physician’s guidance, do not self-medicate, so as not to cause adverse consequences.