"there are various manufacturer of clonazepam. i always made sure to stay with the same manufacturer. however, a week into taking the pills from my new prescription i started to feel very ill. i still had several pills from my previous refill because i only required  1/2 of the 0.5 mg. it was prescribed for me for chronic neck pain. the manufacturer changed the ingredients and now i have been suffering for months to find a replacement to no avail. it&#039;s been working well for years but right now the horrible effects i&#039;m getting i don&#039;t think i&#039;d recommended to any one. please try every option before having to suffer the consequences in the long run."