Can you withdrawal from Promethazine?

Not specifically. Phenothiazines (the class of drug Promethazine belongs to) does not really have the potential to have physical dependency and a true withdrawal syndrome, but many people who are on this class of agents as well as antidepressants can have a "discontinuation" syndrome, with anxiety, irritability and sometimes "electric shock" sensations after stopping it suddenly. If that happens, taper it slowly.