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Sildenafil is also available in generic form. Sildenafil is used to treat erectile dysfunction (ED) and to reduce blood pressure in pulmonary arterial hypertension (PAH). Tadalafil has two formulations – one that can be taken 'as required', and one that can be taken daily. Try other ED and PE medications that SildenafilViagra store proposes for. PDE-5 blockers also relax blood vessels in. SILDENAFIL. BUSY . No prescription needed. Kamagra Chewables is used to treat the. Viagra is a phosphodiesterase type 5 (PDE5) inhibitor that aids in the relaxation of the smooth muscles. Prices starting at. It is in the phosphodiesterase-5 inhibitor (PDE5-I) class of medications. From $1. Instead, you could pay $11. Precautions. Chewable medications can be a convenient alternative for people who dislike swallowing pills. You don’t need to have any food intake when taking this product. may be increased to 100 mg or reduced to 25 mg, depending on effectiveness and tolerance. 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