Effect of glycosides can be enhanced by K deficiency. Enhanced K excretion w/ saluretics/laxatives. Reduced blood sugar-lowering effect of antidiabetic agents. Reduced or enhanced efficacy of coumarin anticoagulants. Increased risk of GI haemorrhages w/ non-steroidal antiphlogistic/antirheumatic agents, salicylates & indomethacin. Prolonged muscle relaxation effect of non-depolarising muscle relaxants. Additional increases in IOP w/ atropine & other anticholinergics. May lower blood conc of praziquantel. Increased risk of myopathies, cardiomyopathies w/ chloroquine, hydroxycloroquine, mefloquine. Reduced efficacy of somatropin. Enhanced efficacy w/ estrogens (eg, OCs). Possible inhibition of metabolism w/ liquorice. Reduced efficacy w/ rifampicin, phenytoin, barbiturates, bupropion, primidone. Increased blood levels of cyclosporine; increased risk of seizures w/ cyclosporine. Increased risk of hypokalaemia w/ amphotericin B. Enhanced effects of cyclophosphamide. Increased risk of occurrence of blood count changes w/ ACE inhibitors. Increased risk of systemic side effects w/ CYP3A inhibitors. Reduced absorption w/ Al & Mg antacids.