There are many causes of muscle weakness, including hypocalcemia, myasthenia gravis, and myasthenia gravis syndrome. 1. Hypocalcemia: Vitamin D and calcium gluconate can be supplemented. 2. Myasthenia gravis: commonly used drugs include anticholinesterase drugs, immunosuppressants, etc. (1) Anticholinesterase drugs: such as neostigmine, pyridostigmine, mesostigmine and so on. Adverse effects of this class of drugs include salivation, sweating, diarrhea, abdominal pain, and muscle throbbing. They are contraindicated in patients with angina pectoris, epilepsy, ventricular tachycardia, and mechanical intestinal obstruction. (2) Immunosuppressive drugs: such as cyclophosphamide, azathioprine and so on. This class of drugs can cause leukopenia and thrombocytopenia. It is prohibited for women during pregnancy. 2. Myasthenia gravis syndrome: Symptomatic treatment can be applied to acetylcholine release enhancers, such as 3,4-diaminopyridine, and adverse effects include gastrointestinal symptoms, seizures, and mental confusion. Patients with a history of epilepsy, pregnancy and labor are prohibited. If the above symptoms occur, you should go to the hospital in time to identify the cause of the disease and take regular treatment under the guidance of the doctor. The above drugs should be applied under the guidance of pharmacists and doctors, avoid self-medication to avoid adverse effects.