Mr. Tibbs: I appreciated your inquiry and replies. Thank you! I have some "off/on" questions myself and would be happy to have you and other readers help me out. What do I do if while in the middle of some activity, like shopping in a food store, I switch to off? Would quickl;y chewing a Sinemet help me? Are there any techniques that may help prevent off periods? I'd like very much to hear from as many PD'ers as possible so thst I may benefit from their experience and wisdom.