Will ddavp (desmopressin) help me focus?

NO. Ddavp (desmopressin) or vasopressin is a drug that mimics antidiuretic hormone, a chemical that rises during sleep to concentrate urine at night. It is used to treat bedwetting and a syndrome where ADH is lacking.

Related Questions

Can ddavp (desmopressin) help me focus better?

Probably not. Not really -- that is not its function or one of the side effects (that I am aware of).