Treatment for methotrexate poisoning: (A) Dietary folic acid, (B) Niacin, (C) Folinic acid, (D) Biotin
Answer is C. Methotrexate poisoning: The toxicity of Mtx cannot be overcome by folic acid, because it will not be conveed to the active coenzyme form(due to inhibition of DHFA reductase by Mtx) Treatment:- Folinic acid (N5 formyl THFA, cirovorum factor) rapidly reverses the effects. Thymidine also counteracts Mtx toxicity. Ref:- kd tripathi; pg num:- 862