NATURETIN-10
Clinical safety rating: caution
Comprehensive clinical and safety monograph for NATURETIN-10 (NATURETIN-10).
Bendroflumethiazide is a thiazide diuretic that inhibits the sodium-chloride symporter (NCC) in the distal convoluted tubule of the nephron, increasing excretion of sodium, chloride, and water. It also reduces peripheral vascular resistance and has antihypertensive effects.
| Metabolism | Primarily hepatic via cytochrome P450 enzymes; minimal renal excretion of unchanged drug. |
| Excretion | Primarily renal (approximately 50-70% as unchanged drug); biliary/fecal elimination accounts for the remainder (30-50%). |
| Half-life | Terminal elimination half-life is approximately 2-4 hours; clinical context: dose adjustments may be needed in renal impairment. |
| Protein binding | Approximately 90% bound to plasma proteins (primarily albumin). |
| Volume of Distribution | 0.3-0.5 L/kg; consistent with distribution primarily in extracellular fluid. |
| Bioavailability | Oral bioavailability is approximately 50-70% due to first-pass metabolism. |
| Onset of Action | Oral: 1-2 hours; clinical effect begins within 1-2 hours after administration. |
| Duration of Action | 6-12 hours; clinical note: duration varies with renal function and dose. |
| Molecular Weight | 421.41 |
Adults: 10 mg orally once daily.
| Dosage form | TABLET |
| Renal impairment | GFR 30-89 mL/min: no adjustment; GFR <30 mL/min: not recommended. |
| Liver impairment | Child-Pugh A: no adjustment; Child-Pugh B: reduce dose by 50%; Child-Pugh C: avoid use. |
| Pediatric use | Not established for pediatric patients. |
| Geriatric use | Start at 5 mg once daily; titrate cautiously due to increased sensitivity. |
| 1st trimester | Avoid: NATURETIN-10 (bendroflumethiazide) is a thiazide diuretic. Use in first trimester is associated with potential risk of fetal harm, including congenital malformations, based on limited human data. In animal studies, increased fetal mortality and growth retardation were observed at high doses. Avoid unless essential. |
| 2nd trimester | Use with caution: In second trimester, thiazides may cause electrolyte imbalances in the mother and fetus. Can be used if benefit outweighs risk, but monitoring of fetal growth and maternal electrolytes is recommended. |
| 3rd trimester | Use with caution: Third trimester use can cause maternal hypovolemia, electrolyte disturbances, and fetal/neonatal effects such as jaundice, thrombocytopenia, and electrolyte disturbances. May reduce placental perfusion. Avoid in preeclampsia unless specifically indicated. |
Clinical note
Comprehensive clinical and safety monograph for NATURETIN-10 (NATURETIN-10).
| Placental transfer | NATURETIN-10 (bendroflumethiazide) crosses the placenta and can reach fetal concentrations comparable to maternal levels. Evidence from studies indicates significant placental transfer, with potential accumulation in fetal tissues. |
■ FDA Black Box Warning
None.
| Serious Effects |
AnuriaKnown hypersensitivity to thiazides or sulfonamide-derived drugsSevere renal impairment (eGFR < 30 mL/min)Severe hepatic impairment (including hepatic coma)Refractory hypokalemiaHypercalcemiaSymptomatic hyperuricemia (gout)
| Precautions | Electrolyte imbalance (hypokalemia, hyponatremia, hypomagnesemia), Hyperuricemia and gout, Hyperglycemia in diabetic patients, Hypercalcemia, Photosensitivity, Exacerbation of systemic lupus erythematosus |
| Food/Dietary | Avoid excessive potassium-rich foods (bananas, oranges, tomatoes) if hypokalemia is corrected with potassium supplements. Decreased absorption with high-fiber foods; take on empty stomach. Grapefruit juice may increase absorption, but data are limited. |
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| Breastfeeding | NATURETIN-10 is excreted into breast milk in small amounts. Thiazides may suppress lactation, especially at high doses. Use during breastfeeding is generally not recommended, but if required, the lowest effective dose should be used and the infant monitored for signs of electrolyte imbalance, dehydration, and jaundice. |
| Lactation Rating | L3 (Moderately Safe) – consider risk vs benefit; monitor infant. |
| Teratogenic Risk | There is no data on NATURETIN-10 in pregnancy. Based on pharmacology, theoretical risk exists. First trimester: potential teratogenic effects cannot be ruled out. Second and third trimesters: may cause fetal renal impairment, oligohydramnios, and skull ossification delay. |
| Fetal Monitoring | Monitor maternal blood pressure, renal function, and electrolytes. In pregnancy, perform serial fetal ultrasound to assess amniotic fluid volume and fetal growth. Consider fetal renal artery Doppler if prolonged use. |
| Fertility Effects | No specific data. Some antihypertensives may affect sperm parameters or ovulation, but clinical significance unknown. Reversible effects possible. |
| Clinical Pearls | Naturetin-10 (bendroflumethiazide 10 mg) is a thiazide diuretic used for hypertension and edema. Monitor serum potassium and magnesium; hypokalemia increases digoxin toxicity risk. Onset of diuresis is 2 hours, peak at 4-6 hours, duration 12-24 hours. Reduce dose in renal impairment (CrCl <30 mL/min). May cause hyperglycemia, hyperuricemia, and hypercalcemia. Avoid in anuria or sulfonamide allergy. |
| Patient Advice | Take in the morning to avoid nighttime urination. · Report symptoms of electrolyte imbalance: muscle cramps, weakness, irregular heartbeat. · Limit alcohol and NSAIDs to reduce blood pressure lowering effect. · Avoid prolonged sun exposure; thiazides can cause photosensitivity. · Maintain adequate fluid intake unless fluid restricted. |