I have M S , and have been taking zoloft for many years. It has worked well for me. But fatique has been a constant problem . I recently retired from the Postal Service as a letter carrier. Now all I Want to do is sleeep. I also have Spinal Stenosis, which also make legs hurt, requiring steroid injections in my spine,as needed. I asked my Dr about ritalin because of a former patron on my mail route also has MS. He hase been taking this drug for some time. He told me that it acually gives him energy! My Dr. has now prescribed this for me. Is this safe for me. Iam 62 years old, and I also have asthma. Can you help me out? Thank You,,, Marilyn Wick St Louis Mo.