Patients w/ electrolyte disturbances, history of gout, allergy or bronchial asthma, DM, parathyroid disease, hypercholesterolaemia. May exacerbate SLE. Hepatic and mild to moderate renal impairment. Pregnancy and lactation. Monitoring Parameters Assess wt, input and output reports daily to determine fluid loss, BP, serum electrolytes, BUN, creatinine.
Lactation: Drug excreted in breast milk; use with caution (American Academy of Pediatrics states that it is "compatible with nursing")
Animal reproduction studies have failed to demonstrate a risk to the fetus and there are no adequate and well-controlled studies in pregnant women OR Animal studies have shown an adverse effect, but adequate and well-controlled studies in pregnant women have failed to demonstrate a risk to the fetus in any trimester.
Mode of Action
Hydrochlorothiazide inhibits the reabsorption of Na and chloride in the distal tubules causing increased excretion of Na and water K and hydrogen ions.
Interaction
Increases toxicity of lithium. May potentiate orthostatic hypotension w/ barbiturates and narcotics. Enhanced neuromuscular blocking action of competitive neuromuscular blockers (e.g. atracurium). Increased hypokalaemic effect w/ corticosteroids, corticotropin, beta2 agonists (e.g. salbutamol). Additive effect w/ other antihypertensives. Potentiation of orthostatic hypotension w/ barbiturates or opioids. Reduced antihypertensive effect by drugs that cause fluid retention (e.g. corticosteroids, NSAIDs, carbenoxolone). Enhanced nephrotoxicity of NSAIDs. Reduced therapeutic effect of antidiabetics.
Pregnancy Category Note
Pregnancy category: B
Lactation: Drug excreted in breast milk; use with caution (American Academy of Pediatrics states that it is "compatible with nursing")
Adult Dose
Oral
Hypertension
Adult: Initially, 12.5 mg, may increase to 25-50 mg once daily as necessary either alone or w/ other antihypertensives.
Elderly: 12.5-25 mg once daily, titrate as necessary in increments of 12.5 mg.
Oedema
Adult: 25-100 mg daily in 1-2 divided doses or intermittently on alternate days or on 3-5 days a wk.
Elderly: 12.5-25 mg once daily, titrate as necessary in increments of 12.5 mg.
Child Dose
Oral
Hypertension
Child: <6 mth 1-3 mg/kg/day in 1-2 divided doses. Max: 37.5 mg daily;
6 mth to 2 yr 1-2 mg/kg/day in 1-2 divided doses. Max: 37.5 mg daily;
>2-12 yr 1-2 mg/kg/day in 1-2 divided doses Max: 100 mg daily.
Oedema
Child: <6 mth 1-3 mg/kg/day in 1-2 divided doses. Max: 37.5 mg daily;
6 mth to 2 yr 1-2 mg/kg/day in 1-2 divided doses. Max: 37.5 mg daily;
>2-12 yr 1-2 mg/kg/day in 1-2 divided doses Max: 100 mg daily.
Renal Dose
Renal impairment
CrCl <10 mL/min: Avoid use
CrCl >10 mL/min: Dose adjustment not necessary; not effective with CrCl <30 mL/min unless used in combination with loop diuretic
Administration
Should be taken with food.
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