 [ Symptoms ] is it safe to take cefdinir antibiotic and microgestin birth control together  i recently got diagnosed with tonsillitis for the second time and was prescribed cefdinir as my antibiotic but i am also on bcp i know that antibiotics can reduce the efficacy of bcp but are there any other health effects i should know of [ Disease ] they are safe to take together and you are correct antibiotics may reduce the effectiveness of oral contraceptives so it would be wise to add another form of birth control until the antibiotic course has been completed