Praziquantel tablet Praviac is a medication used to treat infections caused by parasitic worms, such as schistosomiasis and tapeworm infections. It works by causing paralysis and death of the worms, which are then eliminated from the body through the faeces. The dosage of praziquantel tablet depends on the type and severity of the infection, as well as the patient's age and weight. It is usually taken orally, with or without food, and may require multiple doses over a period of several days. Common side effects of praziquantel tablet include headache, dizziness, nausea, vomiting, abdominal pain, and diarrhea.