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Diethylcarbamazine Over The Counter, containing Diethylcarbamazine (DEC), is an effective medicine for treating parasitic infections such as lymphatic filariasis, eosinophilia, and tropical pulmonary eosinophilia. Once taken, it begins working within a few hours by killing microfilariae (larval worms) circulating in the blood. Most patients notice symptomatic relief, such as reduced fever, cough, or swelling, within 2–3 days of treatment. However, the full course may last days to weeks, depending on the severity of infection and medical guidance. Consistent use as prescribed is essential for complete clearance of parasites and long-term relief. Always follow your doctor’s instructions for safe results.