Aceclofenac: Increase plasma conc of lithium, digitoxin & methotrexate. May inhibit activity of diuretics. Enhance anticoagulant activity. Convulsion may occur w/ quinolones. Increased incidence of side effects w/ corticosteroids. Paracetamol: May increase risk of paracetamol toxicity in patients receiving potentially hepatotoxic drugs or drugs that induce hepatic microsomal enzymes. Increased absorption w/ rifampicin, INH, chloramphenicol, antiepileptic & antiviral drugs, metoclopramide. Altered plasma conc w/ probenecid. Reduced absorption w/ cholestyramine.