Always consult your health care professional before using this, or any other, drug. Do not treat yourself for coughs, colds, or pain while you are taking this medicine without asking your doctor or health care professional for advice. Hypokalemia may be avoided or treated by use buy in tenoretic uk of potassium supplements or foods with high potassium content. How should take Tenoretic Atenol,Chlorthalidone 100 mg? Take Tenoretic Atenol,Chlorthalidone 100 mg exactly as directed by your doctor. If replacing clonidine by beta-blocker therapy, the introduction of beta blockers should be delayed for several days after clonidine administration has stopped. This medication may reduce the potassium levels in your blood. Clinical Laboratory Test Findings Clinically important changes in standard laboratory parameters were rarely associated with the administration of Tenoretic.