When I first starting posting here, I met this girl that had been on phen for 9 years. I have only been on close to 7 so this was very interesting to me. She has the numbness and tingling problems. She experiences this often. She also jerks. This is a reflex thing. It happens with the legs (and arms too.) More often at night when you are almost asleep. There is a name for these symptoms but I'm too tired to remember right now. Here's another one (I think it's called, hyperreflexia.) Do you ever notice that you don't relax your legs or feet? Like if you are sitting with your legs crossed, you keep your calf muscle tightened so your foot is arched up? You might notice this after awhile and then once you are aware of it, relax your leg. Carrying those plastic grocery bags is a big mistake. It takes about 1 minute for you fingers to go numb when the bags are heavy. It can take weeks to get the feeling back.
The PDR doesn't list many (any really) neuro (brain and spinal cord) problems associated with phentermine use. But, the PDR doesn't have all the answers. Some things are even left out

. Never seen or known of any long-term effects of phentermine study. More people are talking about numbness and tingling. You would think that someone should be doing a study on this.