Mebendazole 100 mg is an antiparasitic medication widely used in humans to treat infections caused by intestinal worms. It belongs to a class of drugs known as anthelmintics, which work by preventing worms from absorbing glucose, an essential nutrient. Without glucose, the worms lose energy, become immobilized, and eventually die, allowing the body to eliminate them naturally through the digestive system. Mebendazole 100 mg is commonly prescribed for infections such as roundworm , pinworm , hookworm, and whipworm. In many cases, a single dose or a short course of treatment is sufficient, although some infections may require repeated dosing after two weeks to prevent reinfection. Mebendazole is often recommended in both adults and children, usually above one year of age, depending on medical advice. Mebendazole 100 mg is generally well tolerated. Mild side effects may include stomach pain, diarrhea, nausea, or headache. Serious side effects are rare when used for short courses. However, it should be used with caution in pregnant women, especially during the first trimester, and in people with liver disease. This medication should always be taken as directed by a healthcare professional. Maintaining good hygiene and sanitation alongside treatment helps prevent reinfection and supports complete recovery from intestinal worm infections.