Observant, I am interested in ketamine nasal sprays as well..I realllly want to try ketamine..but I have never put anything up mynose before and dotn know a thing about IV..so spray would be ideal...but how long would it last with this method..I prob wont be doing it for a while as I have no access to ketamine from a trustable person..so I want to collect as much info as I can in the meantime..I am guess it's not as hard on the sinuses either?