RT Journal Article SR Electronic T1 Interactions between phenytoin, phenobarbitone and other drugs JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 13 OP 14 DO 10.1136/dtb.14.4.13 VO 14 IS 4 YR 1976 UL http://dtb.bmj.com/content/14/4/13.abstract AB Many epileptic patients take more than one anticonvulsant drug. Interactions between these anticonvulsants and with other non-anticonvulsant medicaments are common.1 As with other drugs, interactions may occur at several sites, including absorption, plasma protein binding, biotransformation and excretion. We recently discussed the effects of anti-epileptic drugs on vitamin D, steroid and folate absorption and metabolism.2