Effects of oral melatonin and gabapentin on tube placement in trachea for anaesthesia in patient posted for surgery

Intervention1: Oral study drugs 120 min before induction of anaesthesia: To study Haemodynamic responses to both drugs
Control Intervention1: Tablet Gabapentin: Oral Gabapentin 800 mg in study group will be given 120 min before induction of anaesthesia
in double blind manner.
Placebo tablets 120 min before induction of anaesthesia in control group
Control Intervention2: Tab Melatonin: Tab melatonin 6 mg orally 120 min before induction of anaesthesia
Primary outcome(s): SBP,DBP,MAP,HRTimepoint: Just after intubation,1min,3min,5min,10min
Study Design: Randomized, Parallel Group, Placebo Controlled Trial
Method of generating randomization sequence:Computer generated randomization Method of allocation concealment:Sequentially numbered, sealed, opaque envelopes Blinding and masking:Participant, Investigator and Outcome Assessor Blinded