NATURETIN-2.5
Clinical safety rating: caution
Comprehensive clinical and safety monograph for NATURETIN-2.5 (NATURETIN-2.5).
Bendroflumethiazide is a thiazide diuretic that inhibits the sodium-chloride symporter (NCC) in the distal convoluted tubule of the kidney, reducing sodium and chloride reabsorption and promoting diuresis.
| Metabolism | Primarily hepatic via CYP450 enzymes; excreted renally as unchanged drug and metabolites. |
| Excretion | Renal excretion: approximately 95% as unchanged drug; biliary/fecal: <5%. |
| Half-life | Terminal elimination half-life: 6-9 hours; prolonged in renal impairment and in elderly patients. |
| Protein binding | Approximately 90% bound to plasma proteins (albumin). |
| Volume of Distribution | 0.7-1.5 L/kg; indicates extensive distribution into tissues. |
| Bioavailability | Oral: approximately 50-70% due to first-pass metabolism. |
| Onset of Action | Oral: 1-2 hours. |
| Duration of Action | Oral: 12-24 hours; antihypertensive effect persists for up to 24 hours with once-daily dosing. |
| Molecular Weight | 421.5 Da |
Hypertension: 2.5 mg orally once daily; may increase to 5 mg daily if needed. Edema: 2.5 to 10 mg orally once daily.
| Dosage form | TABLET |
| Renal impairment | eGFR <30 mL/min: Use with caution; consider alternative diuretic. eGFR <15 mL/min: Avoid use. |
| Liver impairment | Mild to moderate impairment (Child-Pugh A/B): No adjustment necessary. Severe impairment (Child-Pugh C): Avoid use. |
| Pediatric use | Not recommended for pediatric use; safety and efficacy not established. |
| Geriatric use | Start at 2.5 mg orally once daily; titrate slowly due to increased risk of electrolyte imbalance and hypotension. |
| 1st trimester | Avoid unless compelling need; associated with fetal abnormalities in animal studies. |
| 2nd trimester | Use only if clearly needed; may cause fetal harm (oligohydramnios, renal effects). |
| 3rd trimester | Contraindicated due to risk of oligohydramnios, neonatal hypotension, renal failure. |
Clinical note
Comprehensive clinical and safety monograph for NATURETIN-2.5 (NATURETIN-2.5).
| Placental transfer | Crosses placenta; detected in cord blood. |
| Breastfeeding | Excreted into breast milk in low amounts; monitor infant for hypotension, electrolyte disturbances. |
| Lactation Rating | L3 (Moderately Safe) |
■ FDA Black Box Warning
No FDA black box warning.
| Serious Effects |
AnuriaSevere renal impairment (CrCl <30 mL/min)Hypersensitivity to thiazides or sulfonamides
| Precautions | Electrolyte disturbances: hypokalemia, hyponatremia, hypomagnesemia, Hyperuricemia and gout, Hypercalcemia, Orthostatic hypotension, May exacerbate diabetes mellitus, Sulfonamide allergy cross-reactivity, Photosensitivity, Systemic lupus erythematosus exacerbation |
| Food/Dietary | Avoid excessive intake of salt substitutes or potassium supplements unless directed by your doctor, as thiazides can cause potassium loss., Limit alcohol consumption, as it may increase the risk of orthostatic hypotension., Avoid high-tyramine foods (e.g., aged cheeses, cured meats) if also taking MAO inhibitors, but no specific dietary restrictions with bendroflumethiazide alone. |
Loading safety data…
| Teratogenic Risk | Pregnancy Category D. First trimester: Associated with fetal anomalies including neural tube defects and cardiovascular malformations. Second and third trimesters: Risk of fetal renal dysfunction, oligohydramnios, and neonatal hypotension. |
| Fetal Monitoring | Monitor maternal blood pressure, serum electrolytes, and renal function. Fetal ultrasound for growth and amniotic fluid volume; fetal heart rate monitoring. |
| Fertility Effects | May cause reversible impairment of spermatogenesis in males. In females, possible ovulatory suppression. |
| Clinical Pearls | Naturetin-2.5 (bendroflumethiazide) is a thiazide diuretic primarily used for hypertension. Monitor serum potassium and magnesium levels, as hypokalemia and hypomagnesemia are common. Use cautiously in patients with renal impairment (CrCl <30 mL/min) as effectiveness diminishes. Avoid in patients with anuria or sulfonamide allergy. May cause hyperuricemia and hyperglycemia; monitor in gout and diabetic patients. |
| Patient Advice | Take this medication exactly as prescribed, preferably in the morning to avoid nighttime urination. · Avoid prolonged sun exposure and use sunscreen; thiazides can increase photosensitivity. · Report symptoms of electrolyte imbalance such as muscle cramps, weakness, or irregular heartbeat. · Do not stop taking this medicine abruptly; sudden discontinuation may worsen blood pressure. · If you miss a dose, take it as soon as you remember unless it is close to the next dose; do not double the dose. |