The effectiveness of taking tetracycline for a cough is related to the cause of the cough. If the cough is caused by a mycoplasma infection, taking tetracycline may be effective. There are many diseases that cause coughs, which can include respiratory infectious diseases, allergic diseases, nasopharyngeal diseases, digestive diseases, and many other diseases. Tetracycline is an antibiotic that can be used to treat infectious diseases of the respiratory system, especially infections of the genus Mycoplasma, so the drug may be effective for coughs caused by Mycoplasma infections. However, the current common pathogenic bacteria on tetracycline resistance phenomenon is serious, generally only through the drug sensitivity test proved that the pathogenic bacteria on the drug sensitivity, there is an indication for the use of the drug. Adverse gastrointestinal reactions such as nausea and vomiting, skin rash, liver damage, nephrotoxicity and other adverse reactions may occur with tetracycline. Tetracycline is contraindicated in people who are allergic to tetracyclines and should not be used by women during pregnancy. If the patient has a frequent cough, it is recommended to seek medical advice to clarify the cause of the disease and treat the cause, not to take medication on their own.