Dear Hilary: I've wondered myself why I hadn't heard of more users of Cogentin- my husband was started on it alone, when DX in l986. For two or three years it kept his tremors to almost nothing, and he had increased up to 8mg/day. When the rigidity and falling started he finally managed to get on Sinimet (earlier tries had made him terrribly sick) , which we then started reducing the Cogentin, just because we have felt all along, the least medicine to do the job is the best. He finally got down to lmg/day, as we increased Sinimet and have tried agonists and Eldepryl (bummer for him). His neurologist now says the Cogentin shouldn't be doing him any good, wants him to stop if can, but in three efforts to quite, the tremors have returned. Now that I hear that others have had trouble with getting off it, we may try a more gradual attempt and watch for other withdrawel symptoms. We've always been aware that Cogentin can cause hallucinations, give dry mouth, and contributes to constipation. Thanks all for the info- wanted to contribute our experiences since he's been on it for l2 yr. now. Marie & Judd