Role of benadone in modified ATT
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benadone pyridoxine role modified ATT anti tuberculosis therapy
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Role of Benadon (Pyridoxine / Vitamin B6) in Modified ATT
Benadon is the brand name for pyridoxine (Vitamin B6). It is given as a supplementary addition to anti-tuberculosis therapy (ATT), not as an anti-TB drug itself.
Why is it Given?
Isoniazid (INH), the backbone of all ATT regimens, interferes with pyridoxine (Vitamin B6) metabolism. It does this by:
- Competing with pyridoxal phosphate (PLP) - INH forms an inactive hydrazone complex with pyridoxal, depleting active B6.
- This depletion causes peripheral neuropathy - the most common neurotoxic side effect of isoniazid.
Peripheral neuropathy from INH occurs in up to 2% of patients at standard doses (5 mg/kg), but the risk is much higher in susceptible groups.
- Harrison's Principles of Internal Medicine 22E, p. 1465: "Isoniazid appears to interfere with pyridoxine (vitamin B6) metabolism... Peripheral neuropathy associated with isoniazid occurs in up to 2% of patients given 5 mg/kg."
High-Risk Groups Who MUST Receive Pyridoxine
Prophylactic pyridoxine (25-50 mg/day) is especially important for:
| Risk Factor | Reason |
|---|---|
| HIV infection | Baseline B6 deficiency; higher neuropathy risk |
| Diabetes mellitus | Pre-existing risk of peripheral neuropathy |
| Alcohol abuse | B6 depletion; baseline neuropathic state |
| Malnutrition / undernutrition | Low B6 stores |
| Pregnancy / postpartum | Increased B6 requirements |
| Chronic renal failure | Altered B6 metabolism |
| Elderly patients | Reduced nutritional reserves |
| Receiving stavudine or other neuropathic drugs | Additive neurotoxicity |
- Harrison's 22E: "These patients should be given prophylactic pyridoxine (25-50 mg/d)."
Doses of Pyridoxine in ATT
| Population | Recommended Dose |
|---|---|
| Adults (routine, prophylactic) | 25-50 mg/day |
| Children (prophylactic) | 10 mg/day |
| Malnourished adults | 50 mg/day |
| Children with HIV | 0.5-1 mg/kg/day |
| Treatment of established neuropathy | Higher doses (100-200 mg/day) |
Standard ATT regimen co-prescription: 25-50 mg pyridoxine daily alongside isoniazid.
What is "Modified ATT"?
Modified ATT refers to ATT regimens adjusted for:
- Drug-resistant TB (MDR-TB, XDR-TB, RR-TB)
- Special populations (renal failure, liver disease, HIV, pregnancy)
- Drug intolerability
In all modified regimens that contain isoniazid (including high-dose isoniazid used in some MDR protocols), pyridoxine supplementation remains mandatory. In regimens that have replaced isoniazid entirely (e.g., BPaLM - Bedaquiline, Pretomanid, Linezolid, Moxifloxacin), pyridoxine is still often given because linezolid itself can also cause peripheral neuropathy.
Summary
| Aspect | Detail |
|---|---|
| Drug name | Pyridoxine (Vitamin B6); Brand: Benadon |
| Role | Prevent isoniazid-induced peripheral neuropathy |
| Mechanism | Replenishes pyridoxal phosphate depleted by INH |
| Standard dose | 25-50 mg/day in adults |
| Routine use | Given to all patients on isoniazid; mandatory in high-risk groups |
| ATT component | Adjuvant/supportive - NOT an anti-TB drug |
Benadon does not have any anti-mycobacterial activity. Its sole role in ATT is neuroprotective - preventing the peripheral neuropathy that isoniazid can cause by depleting active Vitamin B6 stores.
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