After taking erythromycin, you can usually drink alcohol normally after 24 hours. Erythromycin is a macrolide antibiotic with strong antibacterial activity against gram-negative, gram-positive and anaerobic bacteria, as well as mycoplasma and chlamydia. The drug itself does not react with alcohol; however, erythromycin has to be metabolized by the liver and has a significant stimulating effect on the gastrointestinal tract. Therefore, if you drink alcohol after taking erythromycin, it will aggravate the burden on the liver, and at the same time, it will easily lead to the occurrence of gastrointestinal reactions and even cause gastric ulcers and gastric bleeding. Erythromycin is a short-acting drug with a relatively short half-life of only 3 hours, so after a half-life of 4-8 hours, erythromycin is basically metabolized completely in the body and does not cause any burden to the liver, kidney function and gastrointestinal tract, so there is no effect on drinking at this time. However, during the course of illness, as the body is in the repair period, it is not recommended to drink any alcohol, as it is not conducive to the recovery of the disease.