I've been prescribed amitriptyline to take at night for my depression, anxiety, chronic fatigue and pain. I see it has been out for a long time. Does anyone know if there are any particular generic manufacturers that are better than others for this med? I ask because on several other meds in the past I could notice a significant difference from certain generic drug makers, especially with paxil, effexor, and klonopin. I know its supposed to be "therapeutically equivalent" but they can definitely vary. Thank you.