Erythromycin Acetazolamide

Drugs that have been shown, or would be expected, to increase plasma carbamazepine levels include cimetidine, danazol, diltiazem, macrolides, erythromycin, troleandomycin, clarithromycin, fluoxetine, fluvoxamine, nefazodone, loratadine, terfenadine, isoniazid, niacinamide, nicotinamide, propoxyphene, azoles (e.g., ketaconazole, itraconazole, and fluconazole), acetazolamide, verapamil, grapefruit juice, ... 

Noninterfering acebutolol, acetaminophen, acetazolamide, alprenolol, apraclonidine, atenolol, atropine, betamethasone, betaxolol, bupivacaine, caffeine, Q clopentolate, dexa-methasone, diphenhydramine, erythromycin, haloperidol, lidocaine, phenylephrine, polymyxin B, procaine, scopolamine, timolol, tropicamide... 

An established interaction, which can be exploited. Should erythromycin be used to treat urinary tract infections its efficacy can be maximised by making the urine alkaline (for example with acetazolamide or sodium bicarbonate). Treatment with urinary acidifiers will minimise the activity of the erythromycin for urinary tract infections and should be avoided. There is no evidence that the efficacy of erythromycin in other infections is affected by urinary acidifiers or alkalinisers. 

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