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Medicine to treat HIVAIDS accu-chek aviva test strips generic viagra atazanavir, indinavir, ritonavir, or saquinavir. This list is not complete. Other drugs may interact with sildenafil, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide. More about Viagra (sildenafil) Consumer resources.

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Viagra is taken on an as needed basis, at a dose of 50mg, approximately 1 hour before sexual activity (although can be taken from 30 minutes to 4 hours before). The dose may be increased to 100mg if 50mg is ineffective or decreased to 25mg if side effects are intolerable. 2 Viagra should only be taken once a day even though the effects wear off after approximately 4-5 hours. The main side effects are headache, flushing and indigestion. 2 Rarely, color perception may be altered with Viagra. This side effect does not happen with Cialis.

Medication is available on the NHS for Erectile Dysfunction and there are also some over the counter treatments, however all of these rely on a chemical solution - rather than a natural, drug-free option.]