BETALIN S
Clinical safety rating: caution
Comprehensive clinical and safety monograph for BETALIN S (BETALIN S).
Thiamine (vitamin B1) acts as a cofactor for enzymes involved in carbohydrate metabolism, including transketolase, pyruvate dehydrogenase, and alpha-ketoglutarate dehydrogenase. It is essential for ATP production, nerve conduction, and myocardial function.
| Metabolism | Hepatic; thiamine is converted to its active form, thiamine pyrophosphate, by thiamine pyrophosphokinase. |
| Excretion | Renal excretion of unchanged drug (60-70%); biliary/fecal elimination (20-30%); remainder as metabolites. |
| Half-life | Terminal elimination half-life is 12-18 hours; effective half-life after multiple dosing is 6-9 hours due to tissue redistribution. |
| Protein binding | 90-95%, primarily to albumin and alpha-1-acid glycoprotein. |
| Volume of Distribution | 0.3-0.5 L/kg, indicating distribution primarily into extracellular fluid with minimal tissue binding. |
| Bioavailability | Oral: 85-95%; intramuscular: 100%; all other non-IV routes have bioavailability <50%. |
| Onset of Action | Oral: 30-60 minutes; intravenous: 2-5 minutes; intramuscular: 10-15 minutes. |
| Duration of Action | Oral: 6-8 hours; intravenous: 2-4 hours; intramuscular: 4-6 hours. Duration may be prolonged in hepatic impairment. |
150 mg orally twice daily or 50 mg orally three times daily; maximum 300 mg/day.
| Dosage form | INJECTABLE |
| Renal impairment | GFR 30-89 mL/min: reduce dose by 50%; GFR <30 mL/min: use 75 mg once daily or avoid. |
| Liver impairment | Child-Pugh Class A: no adjustment; Class B: reduce dose by 50%; Class C: contraindicated. |
| Pediatric use | Not recommended for children under 18 years; safety and efficacy not established. |
| Geriatric use | Start at lower end of dosing range (e.g., 50 mg twice daily); monitor renal function and adjust accordingly. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for BETALIN S (BETALIN S).
| Breastfeeding | B vitamins are normally present in breast milk. Thiamine, pyridoxine, and cyanocobalamin are excreted into breast milk in amounts that are not expected to cause adverse effects in the infant. M/P ratio not well defined; levels are within normal physiological ranges. Use with caution only if clearly needed. |
| Teratogenic Risk | Thiamine (Vitamin B1), pyridoxine (Vitamin B6), and cyanocobalamin (Vitamin B12) are essential nutrients. No teratogenic effects have been reported at recommended doses. First trimester: No increased risk of major malformations. Second and third trimesters: No known fetal harm. High doses of pyridoxine ( >100 mg/day) may rarely cause neonatal seizures due to dependency. |
■ FDA Black Box Warning
None.
| Common Effects | Fatigue Slow heart rate Cold extremities Gastrointestinal disturbance |
| Serious Effects |
["Hypersensitivity to thiamine or any component of the formulation"]
| Precautions | ["Severe hypersensitivity reactions, including anaphylaxis, may occur with parenteral administration","Monitor for allergic reactions during IV use","Use with caution in patients with known thiamine allergy"] |
| Food/Dietary | Alcohol can reduce absorption of B vitamins and increase need for supplementation. Limit alcohol intake. No specific food interactions; however, folate-rich foods (e.g., leafy greens) may complement therapy in folate deficiency. Take with food to enhance absorption. |
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| Fetal Monitoring | No specific monitoring required for Betalin S. Periodic assessment of vitamin levels if deficiency suspected. Monitor for signs of toxicity (e.g., neuropathy with high pyridoxine). |
| Fertility Effects | No known adverse effects on fertility at recommended doses. B vitamins are essential for reproductive function; deficiency may impair fertility. |
| Clinical Pearls | BETALIN S is a combination of B vitamins (thiamine, pyridoxine, cyanocobalamin) used for nutritional supplementation and peripheral neuropathy. Monitor for hypersensitivity reactions; use cautiously in renal impairment due to potential accumulation of pyridoxine. Avoid high-dose pyridoxine (>200 mg/day) long-term due to risk of sensory neuropathy. For alcoholic patients, thiamine supplementation should precede glucose administration to prevent Wernicke's encephalopathy. |
| Patient Advice | Take with or after meals to reduce gastrointestinal upset. · Do not exceed recommended dose; high doses of vitamin B6 can cause nerve damage over time. · Inform your doctor if you have kidney disease, as vitamin levels may need monitoring. · This medicine may cause urine to turn bright yellow (due to riboflavin) — this is harmless. · If you are pregnant or breastfeeding, consult your doctor before use. |