Watery stools, sore gums, canker sore in cheek after taking Cephalexin for strep throat. What should I do?

Usually alongwith antibiotics a drug called probiotics is taken inorder to prevent diarrhoea and reabsorption of water caused by antiobiotics. usually diarrhoea occurs in penicillin group of antibiotics like amoxycillin and cloxacillin. you can ask your doctor for you whether it is prescribed for you and take accordingly. if diarrhoea is uncontrollable stop antibiotics and wait for one day and take oral rehydration solution to correct dehydraion. usually diarrhoea stops. If it dont stop or you have abdominal pain following diarrhoea and fever starts in, then it may be due to infection. Do motion for ova cyst and microscopic examination and consult your family doctor. mouth ulcer on 3rd day of antiobiotic is usually not related to side effect of the drug and drug is rash usually manifested in lips and skin. The description of sore gums and canker inside cheek suggests vitamin deficiency or stress, so take multivitamins. you can also go in for throat swab culture and sensitivity after full course of antiobiotics and sore throat not subsiding.