Patients with myasthenia gravis must use ornidazole with caution and under the guidance of a doctor because the side effects of ornidazole may exacerbate myasthenia gravis. However, ornidazole is not relatively or absolutely contraindicated for patients with myasthenia gravis. Generally, the patient's side effects are observed, and if myasthenia gravis is aggravated, the use of ornidazole is recommended to be cautious or prohibited. Ornidazole can cause neurological reactions, including headache, fatigue, dizziness, trembling, limb numbness and weakness, convulsions, mental confusion, epileptic seizures, ataxia, and consciousness disturbances, and may cause peripheral nerve damage.