this is a very good question. to my knowledge there is no serious adverse reaction associated with taking famotidine with an antibiotic. however taking famotidine with an anti-fungal oral medication (such as the ones with names ending in "azole") can have serious side effects. taking certain antacid or anti-gerd medications like famotidine can reduce the effectiveness of other medications when taken together. thus it's a good idea to wait 1-2 hours before or after taking other medications before you take a product like famotidine. because you have finished your antibiotics (good for you! ) the real question is: do you still have symptoms of your illness? if not then you did no harm by combining the two medications. if you still feel ill then i'd suggest you go back to your primary care provider explain the situation and get evaluated to see if you need another course of antibiotics. in all likelihood everything worked out fine. at least that's my hope for you!
does taking famotidine and antibiotics at the same time bad? i take them at the same exact time. i read somewhere to take famotidine 1-2 hrs before or after taking antibiotics i just finished up taking the other antibiotic i was on. anyway im jjst concerned that taking the antibiotics and famotidine at the same time is affecting the potency of the anti iotic helpp