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Lotensin HCT has been evaluated for safety in over 2500 patients with hypertension; over 500 of these patients were treated for at least 6 months, and over 200 were treated for more than 1 year.
The reported side effects were generally mild and transient, and there was no relationship between side effects and age, sex, race, or duration of therapy. Discontinuation of therapy due to side effects was required in approximately 7% of U.S. patients treated with Lotensin HCT and in 4% of patients treated with placebo.
The most common reasons for discontinuation of therapy with Lotensin HCT in U.S. studies were cough (1.0%; see PRECAUTIONS), “dizziness” (1.0%), headache (0.6%), and fatigue (0.6%).
The side effects considered possibly or probably related to study drug that occurred in U.S. placebo-controlled trials in more than 1% of patients treated with Lotensin HCT are shown in the table below.
Reactions Possibly or Probably Drug Related
Patients in U.S. Placebo-Controlled Studies
N = 665
N = 235
Other side effects considered possibly or probably related to study drug that occurred in U.S. placebo-controlled trials in 0.3% to 1.0% of patients treated with Lotensin HCT were the following:
Cardiovascular: Palpitations, flushing.
Dermatologic: Rash and sweating.
Other adverse experiences reported in 0.3% or more of Lotensin HCT patients in U.S. controlled clinical trials, and rarer events seen in post-marketing experience, were the following; asterisked entries occurred in more than 1% of patients (in some, a causal relationship to Lotensin HCT is uncertain):
Neurologic and Psychiatric: Hypesthesia, abnormal vision, abnormal dreams, and retinal disorder.
The following adverse reactions have been identified during post-approval use of either benazapril or hydrochlorothiazide. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency or establish a causal relationship to drug exposure:
Skin: Erythema multiforme including Stevens-Johnson syndrome, and exfoliative dermatitis including toxic epidermal necrolysis.
Clinical Laboratory Test Findings
Creatinine and BUN
Minor reversible increases in serum creatinine and BUN were observed in patients with essential hypertension treated with Lotensin HCT. Such increases occurred most frequently in patients with renal artery stenosis (see PRECAUTIONS).
Read the Lotensin Hct (benazepril hcl and hctz) Side Effects Center for a complete guide to possible side effects
Interactions Common For Both Benazepril And Hydrochlorothiazide
Potassium Supplements and Potassium-Sparing Diuretics
Concomitant use with Lotensin HCT may effect potassium levels. Monitor potassium periodically.
Renal clearance of lithium is reduced by thiazides and increase the risk of lithium toxicity. Increased serum lithium levels and symptoms of lithium toxicity have been reported in patients receiving ACE inhibitors during therapy with lithium. Monitor lithium levels when used concomitantly with Lotensin HCT.
Dual Blockade of the Renin-Angiotensin System (RAS)
Dual Blockade of the RAS with angiotensin receptor blockers, ACE inhibitors, or aliskiren is associated with increased risks of hypertension, hyperkalemia, and changes in renal function (including acute renal failure) compared to monotherapy. Most patients receiving the combination of two RAS inhibitors do not obtain any additional benefit compared to monotherapy. In general, avoid combined use of RAS inhibitors. Closely monitor blood pressure, renal function and electrolytes in patients on Lotensin HCT and other agents that affect the RAS.
Do not co-administer aliskiren with Lotensin HCT in patients with diabetes. Avoid use of aliskiren with Lotensin HCT in patients with renal impairment (GFR < 60 ml/min).
NSAIDs and Cox-2 Selective Agents
In patients who are elderly, volume-depleted (including those on diuretic therapy), or with compromised renal function, co-administration of NSAIDs, including selective COX-2 inhibitors, with ACE inhibitors, including benazepril, may result in deterioration of renal function, including possible acute renal failure. These effects are usually reversible. Monitor renal function periodically in patients receiving benazepril and NSAID therapy.
Benazepril has been used concomitantly with beta-adrenergic-blocking agents, calcium-blocking agents, cimetidine, diuretics, digoxin, hydralazine, and naproxen without evidence of clinically important adverse interactions. Other ACE inhibitors have had less than additive effects with beta-adrenergic blockers, presumably because drugs of both classes lower blood pressure by inhibiting parts of the renin-angiotensin system.
Interaction studies with warfarin and acenocoumarol have failed to identify any clinically important effects of benazepril on the serum concentrations or clinical effects of these anticoagulants.
Gold: Nitritoid reactions (symptoms include facial flushing, nausea, vomiting and hypotension) have been reported rarely in patients on therapy with injectable gold (sodium aurothiomalate) and concomitant ACE inhibitor therapy.
mTOR (mammalian target of rapamycin) inhibitors
Ion exchange resins: Stagger the dosage of hydrochlorothiazide and ion exchange resins such that hydrochlorothiazide is administered at least 4 hours before or 4-6 hours after the administration of resins. Single doses of either cholestyramine or colestipol resins bind the hydrochlorothiazide and reduce its absorption from the gastrointestinal tract by up to 85% and 43%, respectively.
Skeletal Muscle Relaxants
Possible increased responsiveness to muscle relaxants such as curare derivatives.
Dosage adjustment of antidiabetic drug may be required.
Antineoplastic Agents (e.g., cyclophosphamide, methotrexate)
Concomitant use of thiazide diuretics may reduce renal excretion of cytotoxic agents and enhance their myelosuppressive effects.
Drugs that Alter Gastrointestinal Motility
The bioavailability of thiazide-type diuretics may be increased by anticholinergic agents (e.g., atropine, biperiden), apparently due to a decrease in gastrointestinal motility and the stomach emptying rate. Conversely, pro-kinetic drugs may decrease the bioavailability of thiazide diuretics.
Concomitant treatment with diuretics may increase the risk of hyperuricaemia and gout-type complications.
Alcohol, Barbiturates or Narcotics
Concomitant administration of thiazide diuretics with alcohol, barbiturates, or narcotics may potentiate orthostatic hypotension.
Hydrochlorothiazide may reduce the response to pressor amines such as noradrenaline but the clinical significance of this effect is not sufficient to preclude their use.
Read the Lotensin Hct Drug Interactions Center for a complete guide to possible interactions
Last reviewed on RxList: 9/28/2015
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