do different methadone forms associate with different side effects?

methadone is a generic name and a mixture of 1mg/1ml of it is prescribed outside iran and 5mg/1ml of it inside iran, as substitute treatment for narcotics. this medicine is well tolerated by the patients. its various forms make no difference in serum level among patients. side effects of methadone is well recognized and according to the literature, there is no relationship between its side effects and form of the medicine (tablets or syrup); but metabolism of methadone could be affected by various factors. linctus methadone is barely used in treatment settings and sometimes is misunderstood by methadone syrup. methadone tablets are sometimes used in treatment of narcotics, but not as the first line treatment though. transfused methadone come in different dosages and could be prescribed intramuscular and/or subcutaneous.  expanded information regarding methadone will be mentioned in this article.