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Adverse reactions are usually reversible upon reduction of dosage or discontinuation of methyclothiazide (methyclothiazide (methyclothiazide (methyclothiazide tablet 5 mg) tablet 5 mg) tablet 5 mg) tablets. Whenever adverse reactions are moderate or severe, it may be necessary to discontinue the drug.
The following adverse reactions have been observed, but there has not been enough systematic collection of data to support an estimate of their frequency. Consequently the reactions are categorized by organ system and are listed in decreasing order of severity and not frequency.
Body as a Whole:Headache, cramping, weakness.
Cardiovascular System: Orthostatic hypotension (may be potentiated by alcohol, barbiturates, or narcotics).
Hypersensitivity Reactions: Anaphylactic reactions, necrotizing angiitis (vasculitis, cutaneous vasculitis), Stevens-Johnson syndrome, respiratory distress including pneumonitis and pulmonary edema, fever, purpura, urticaria, rash, photosensitivity.
Nervous System: Vertigo, dizziness, paresthesias, muscle spasm, restlessness.
Special Senses: Transient blurred vision, xanthopsia.
Urogenital System: Glycosuria.
Read the Methyclothiazide (methyclothiazide tablet 5 mg) Side Effects Center for a complete guide to possible side effects
Hypokalemia can sensitize or exaggerate the response of the heart to the toxic effects of digitalis (e.g., increased ventricular irritability).
Hypokalemia may develop during concomitant use of steroids or ACTH.
Insulin requirements in diabetic patients may be increased, decreased, or unchanged.
Thiazides may decrease arterial responsiveness to norepinephrine. This diminution is not sufficient to preclude effectiveness of the pressor agent for therapeutic use.
Thiazide drugs may increase the responsiveness of tubocurarine.
Lithiumrenal clearance is reduced by thiazides, increasing the risk of lithium toxicity.
Thiazides may add to or potentiate the action of other antihypertensive drugs. Potentiation occurs with ganglionic or peripheral adrenergic blocking drugs.
Drug/Laboratory Test Interactions
Thiazides may decrease serum PBI levels without signs of thyroid disturbance.
Thiazides should be discontinued before carrying out tests for parathyroid function.
Last reviewed on RxList: 6/4/2009
This monograph has been modified to include the generic and brand name in many instances.
Additional Methyclothiazide Information
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