Filagra, commonly known as generic Viagra, has been a staple in ED treatment since its introduction. Its active ingredient, sildenafil, helps increase blood flow to the penis by inhibiting the enzyme phosphodiesterase type 5 (PDE5). Typically taken 30 minutes to an hour before sexual activity, Filagra is effective for around 4-6 hours. It is generally well-tolerated but can cause side effects such as headaches, flushing, and nasal congestion.
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