Well, possibility of addiction......those that joann mentioned, they don't make me drowsy, they give me a false sense of energy, some have nausea and vomiting, possibility of addiction........constipation, blurry vision, possibility of addiction.....oh and did i mention possiblity of addiction?
they really can vary.... are you on them? they should be on the insert the pharmacist gave you.... a few would be drowsy, constipation, lightheaded & dizzy... I would suggest googling it for further details...
is there a certain reason you are asking?