SIDE EFFECTS: Headache, dizziness, stomach pain, nausea, tiredness, weakness, joint/muscle pain, loss of appetite, vomiting, and sweating may occur. These side effects are usually mild and temporary and may be symptoms of your parasite infection and/or the dying parasites. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these rare but very serious side effects occur: bloody diarrhea, fever, irregular/slow heartbeat, seizures.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the Biltricide (praziquantel) Side Effects Center for a complete guide to possible side effects »

PRECAUTIONS: Before taking praziquantel, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: parasitic eye infection (ocular cysticercosis).

Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver disease/enlarged spleen, heart disease/irregular heart rhythm, parasitic brain infection (cerebral cysticercosis), seizures.

This drug may make you dizzy or drowsy during treatment until the day after treatment. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

This drug passes into breast milk. Breast-feeding while using this drug is not recommended. Nursing mothers should temporarily stop breast-feeding on the day of treatment and for 72 hours after taking the last dose. Pump and discard breast milk during this time.