I have been on methadone for two years at a dosage of 100mgs. a day. Circumstances are preventing me from being able to get my dosage for approxamately 7 to 10 days. I am already feeling the effects and I have been given Phenergan to supposedly help until I am able to get back to my doses. My question is what is the Phenergan supposed to do for me and will it eleviate the pain and muscle cramping that I am expierencing?