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- If you experience Kamagra side effects for the treatment of ED i.e. erectile dysfunction, it is advisable to consult a doctor immediately. Sildenafil acts as the active ingredient in the Kamagra tablet mass. A doctor must be consulted before taking these tablets. Kamagra is also available in different strengths. This Kamagra i.e. Sildenafil is the best drug to improve sexual life. Kamagra is the best sex drug.