Effect of Intrathecal Neostigmine on Post-dural Puncture Headache.

0.5 mg ampule (1 ml) will be diluted in 4 ml dextrose 5% to make a solution of 100 μg/ml, 0.2 ml of this solution will be added to 2.5 ml of hyperbaric bupivacaine 0.5 % used for intrathecal injection.

one ml of normal saline 0.9 % will be mixed with 4 ml dextrose 5 % in the five-milliliter syringe. 0.2 ml of this mixture will be prepared at a one-milliliter identical syringe.