Cephalexin and doxycycline. ^"Comparative trials of doxycycline versus amoxicillin, cephalexin and enoxacin in bacterial infections in chronic bronchitis and asthma". . . . Your doctor is clearly trying to murder you. . Last 2 . This page contains links to eMedTV Antibiotics Articles containing information on subjects from Cephalexin . . Best Answer: Under no circumstances should you combine those two substances. In the words of Crowded House, 'don't let . . It can take quite some . . . you'll... more