Budeprion and late afternoon

A couple of days after switching from Wellbutrin XL (which was effective for me, with no side effects) to Budeprion XL, I began to experience feelings of panic, a choking-like tightness in my throat/neck area, and extreme tension throughout my shoulders and neck. (I have never had a panic attack before.) My doctor said that my symptoms sounded like anxiety. Neither of us made the connection to the recent switch from Wellbutrin to Budeprion. These Budeprion XL side effects began each day in the late afternoon and continued for at least two hours, sometimes longer. Nothing relieved them. I tried relaxation breathing, yoga, meditation, and even Ativan! After several days of this torture, in desperation for some relief from the panic/tightness/tension, I drank a glass of wine when the symptoms set in. The symptoms grew even more severe. It finally occurred to me that the Budeprion might be the source of this frightening problem, and I insisted on being switched back to the Wellbutrin. Ta-da. No more freaking afternoon attacks. A few months later, while experiencing some lower back pain, I took a Budeprion by accident (I found a single tablet in my desk drawer and I mistook it for a codeine-based pain tablet that has a similar appearance...I know--a dumb thing to do!) Hours later, the original side effects returned: extreme panic with neck/shoulder tightness and tension. I have not taken Budeprion since that day (about three months ago), and I have never again experienced those side effects (or any similar symptoms). The name brand Wellbutrin XL is working effectively for me, with no side effects. Because of these experiences, I am convinced that Budeprion XL's contents (or composition) are very different from those of Wellbutrin XL. They may or may not have the same chemical formula, but they certainly do not react the same way in my body.