Fixed-dose combination: angiotensin II receptor blocker plus thiazide diuretic
Updated · Methodology
Second line
Essential hypertension uncontrolled on irbesartan monotherapy. Per ESH/ 2023 and SEH-LELHA 2023 – second-line. Dose: 150/12.5, 300/12.5, 300/25 mg once daily. Full effect at 6–8 weeks. Especially useful in patients with hypertension and type 2 diabetes due to irbesartan's renoprotective effect.
Sources
ICD-10: I10 · ICD-11: BA00
Irbesartan is a non-peptide selective AT1 receptor blocker. T½ 11–15 h gives 24-hour BP reduction with once-daily dosing. Hydrochlorothiazide excretes sodium and water through distal tubules. In type 2 diabetes with microalbuminuria, irbesartan slows progression of diabetic nephropathy (IRMA-2, IDNT trials).
Contraindicated from the 2nd trimester. ARBs and ACE inhibitors cause fetopathy: oligohydramnios, fetal renal failure, skull hypoplasia, limb contractures. In women of reproductive age planning pregnancy, switch in advance to methyldopa, labetalol, or slow-release nifedipine (ACOG 222 (2020), SEGO 2023).
Milk excretion data for the fixed combination are limited. For breastfeeding ESH 2023 and ACOG 2020 recommend switching to enalapril (RID 0.2%), captopril (RID 0.02%), methyldopa, or labetalol.
Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.
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Irbesartan + Hydrochlorothiazide is evaluated for the following indications with varying evidence strength: Hypertension (evidence tier A). See the full indication matrix with dosing and citations above on this page.
Common side effects of Irbesartan + Hydrochlorothiazide (≥ 1 in 100): Dizziness, Hypotension, Hyperkalemia, Hyponatremia, Hyperuricemia, Elevated creatinine. See the Safety section for uncommon and serious reactions.
Contraindicated from the 2nd trimester. ARBs and ACE inhibitors cause fetopathy: oligohydramnios, fetal renal failure, skull hypoplasia, limb contractures. In women of reproductive age planning pregnancy, switch in advance to methyldopa, labetalol, or slow-release nifedipine (ACOG 222 (2020), SEGO 2023).
Milk excretion data for the fixed combination are limited. For breastfeeding ESH 2023 and ACOG 2020 recommend switching to enalapril (RID 0.2%), captopril (RID 0.02%), methyldopa, or labetalol.
Irbesartan + Hydrochlorothiazide is contraindicated in: Hypersensitivity to sartan, thiazides, or sulfonamides; Pregnancy (2nd-3rd trimester); Bilateral renal artery stenosis; Severe renal impairment (CrCl <30 for the thiazide component); Severe hepatic impairment, cholestasis. Full list in the Safety section.
Lisinopril, Losartan, Losartan + Hydrochlorothiazide, Olmesartan medoxomil, Olmesartan + Hydrochlorothiazide, Telmisartan + Hydrochlorothiazide, Amlodipine + Valsartan, Candesartan