May ↑ the effect of warfarin .
May ↓ effectiveness of estrogen-containing oral contraceptives .
Antacids , calcium , iron , and magnesium form insoluble compounds (chelates) and ↓ absorption of tetracycline.
Sucralfate may bind to tetracycline and prevent its absorption from the GI tract.
Cholestyramine or colestipol ↓ absorption.
Adsorbent antidiarrheal agents may ↓ absorption.
Barbiturates , phenytoin , or carbamazepine may ↓ activity of doxycycline.Drug-Food
Calcium in foods or dairy products ↓ absorption by forming insoluble compounds (chelates).
tetracycline has been found in Davis's Drug Guide
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