Aluminum salts, ampicillin, calcium salts Plasma levels and pharmacologic effects may be decreased.
Clonidine May add to or reverse antihypertensive effects; potentially life-threatening situations may occur, especially on withdrawal.
Diltiazem Pharmacologic effects of atenolol may be increased; symptomatic bradycardia may occur.
Nifedipine, verapamil Effects of both drugs may be increased.
NSAIDs Some agents may impair antihypertensive effect.
Prazosin May increase orthostatic hypotension.
Quinidine Pharmacologic effects of atenolol may be increased.
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