Side effects and hazards of Thymopeptide include fever, dizziness, and allergy, and the medication should be administered under the direction of a physician. Thymopeptide, as an immunomodulator, is available in oral and injectable preparations, and may produce a variety of side effects and hazards after use. Among them, Thymopentin Enteric Tablets can cause fever, dizziness, chest tightness, nausea, drowsiness, elevated transaminases, allergy and other side effects, and Thymopentin for Injection can cause pain at the injection site, and in rare cases, redness and swelling, transient muscular atrophy, polyarthralgia with edema, skin rash and other manifestations. However, this drug is generally well tolerated, the use of drugs need to comply with the physician’s assessment and guidance, is prohibited in allergy, organ transplant recipients, thymic hyperfunction and thymic tumor patients, used with caution in pregnant women and lactating women. If side effects occur after using this drug, stop the drug and consult a doctor.