28. Chelating agent that is given intramuscular: * a. EDTA b. Succimer c. Desferrioxamine d. Penicillamine e. BAL
BAL (British Anti-Lewisite / Dimercaprol) is the chelating agent given intramuscularly - answer e.
Here's a quick route summary for all options:
| Agent | Route |
|---|---|
| BAL (Dimercaprol) | IM only (in peanut oil - insoluble in water) |
| EDTA (CaNa2-EDTA) | IV or IM |
| Succimer (DMSA) | Oral |
| Desferrioxamine | IV, IM, or SC (IV preferred in severe iron poisoning) |
| Penicillamine | Oral |
Why BAL must be given IM: Dimercaprol is formulated in peanut oil because it is unstable and poorly soluble in water. This oil-based formulation makes it unsuitable for IV use and necessitates deep IM injection. It is used in poisoning by arsenic, mercury, lead (combined with EDTA), and gold.
The answer is e. BAL.
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