Doxycycline Hydrochloride tablets are usually taken for 7 days or in some cases 14 days depending on the disease being treated. Doxycycline Hydrochloride Tablets, also known as doxycycline, is a tetracycline antibiotic. Its duration and total amount of medication varies depending on the disease. This drug is a broad-spectrum bacteriostatic agent, and at high concentrations it has a bactericidal effect. For some antiparasitic and antibacterial infections, it is usually taken for 7 days. For mycoplasma and chlamydia infections, it is usually taken for at least 7 days, usually 14 days. Specific time to take, to strictly follow the doctor’s instructions to take, they can not blindly medication, not overdose, etc.. If the effect is not obvious after taking it, you should go to the hospital in time to change other drugs. If there are other problems, it is recommended to consult a professional doctor for guidance.