hi dianne and welcome,
how long has your son been on the methadone? what is his dose?
debbie
Hi,
thanks for the query
has he taken it for opioid withdrawal?
if yes then consult your doctor for regarding alternate medication, he can maintain his weight by diet modification and regular exercise, avoid fatty and junk foods. have small and frequent foods instead heavy ones. yoga and pranayam is also helpful for it. he may need counselling for opioid addiction.
wish him a good health.