Mebendazole over the counter is a widely used antiparasitic medication that begins working within hours of ingestion. It targets intestinal worms like pinworms, roundworms, hookworms, and whipworms by preventing them from absorbing glucose, which leads to their death. Although the drug starts acting quickly, visible results—such as relief from itching or abdominal discomfort—typically appear within 24 to 72 hours.

For mild infections like pinworm, a single dose is often effective. However, a second dose after 2 weeks is usually recommended to kill newly hatched worms and prevent reinfection. For more serious or mixed infections, treatment may continue for 3 days or longer, as directed by a healthcare provider.

It’s important to follow hygiene measures (washing hands, cleaning bedding) during and after treatment to avoid re-infection. While fast-acting, mebendazole’s full effectiveness depends on proper use and maintaining a clean environment. Always follow your doctor’s instructions for best results.

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