Sorry to be a buzzkill, but there is no definitive answer to who-is-the-most-reactive-element-amongst-all, because it takes two to tango. One could ask which element is the most reactive with Sodium? The answer then is Fluorine, not Caesium. Or, perhaps you want to know which element is the most reactive with Nitrogen. Its Lithium! Shocker!
1 Day 1: reduce dosage of amitriptyline to 75 mg/day. 2  Day 8: reduce dosage of amitriptyline to 50 mg/day. 3  Day 15: reduce dosage of amitriptyline to 25 mg/day. 4  Day 22: reduce dosage of amitriptyline to 10 mg/day. Day 8: reduce dosage of amitriptyline to 50 mg/day. 2  Day 15: reduce dosage of amitriptyline to 25 mg/day. 3  Day 22: reduce dosage of amitriptyline to 10 mg/day. 4  Day 29: stop administration of amitriptyline.
Amitriptyline must be prescribed from a doctor and comes in pill form with 10, 25, 50, 75, 100 and 150 mg strengths dosages. These pills can be consumed with or without food but must be halved into equal dosages of 40 to 150 mg within a day.