Mebendazole. Are side effects bad?

Mibendazole. Diarrhea; stomach pain. Seek medical attention right away if any of these severe side effects occur when using mebendazole: severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); fever, chills, or persistent sore throat; hoarseness; seizures; yellowing of the eyes or skin.