A written informed consent will be taken from the patients. The study will involve female adults (age 18-40years) of American society of anesthesiologists (ASA) I-II who are listed for elective cesarean section under spinal anesthesia and suffer from postoperative postdural puncture headache (PDPH). Patients will be assigned randomly to three groups (30 subjects each) after PDPH diagnosis was established. First 90 patients developed PDPH will be assessed for study eligibility.~Group D (patients will receive ultrasonic nebulization of dexmedetomidine (1 mg/kg diluted in 4 mL saline) twice daily for three days. Group N (patients will receive nebulization of 20 µ/kg neostigmine and 10 µ/kg atropine mixed in 4 ml) twice daily for three days. Group S (patients will receive nebulization of saline placebo in 4 ml) twice daily for three days.
In our study, we will compare a new route of nebulization for effectiveness between dexmedetomidine, neostigmine/atropine and saline placebo for females complained of postdural puncture headache (PDPH) after cesarean section.