Drinking cola after vaccination usually does not cause any obvious harm to the body, and drinking the right amount of cola after vaccination will not affect the effect of the vaccine, nor will it induce or aggravate the adverse reactions caused by the vaccine, so there is no need to worry too much. Recovery. If you drink a lot of cola, the caffeine in cola has the effect of stimulating the secretion of stomach acid, which may induce or aggravate the adverse reactions after vaccination, such as fever, diarrhea, fatigue and weakness, etc. However, after cola is absorbed and metabolized, the symptoms will be gradually relieved, so it is not recommended to drink a lot of cola after vaccination, but even if you drink a lot of cola, you do not need to be too nervous, and you can pay attention to observe whether there are any uncomfortable symptoms. If there is no discomfort for about 2 days, or if there is only slight discomfort but it is slowly relieved, it can be treated without treatment; if there is discomfort and it is heavy or persistently not relieved, you can seek medical treatment, and it is not recommended to treat it by yourself. Drinking cola after vaccination generally does not affect the effect of vaccine or health because the main component of vaccine is antigen, which induces antibody production by acting on the immune system. The main components of cola include water, carbonic acid, sugar and caffeine, which are digested and absorbed through the gastrointestinal tract and metabolized and discharged through the urinary system, so it does not affect the immune system. The small amount of caffeine in cola may stimulate the nervous system and increase excitability, but it is not likely to affect the immune system and will not inhibit antibody production, so you can drink cola in moderation after vaccination.