how long does it take for ms contin 30 mg to kick in
If it's given orally as MSIR (Morphine Sulphate Immediate Release) (15mg, 30mg pill strengths) then it begins working in 15-20 minutes and peaks around the same time as an IM injection.nswers. Best Answer: If by I.V. it begins working or its ONSET is immediate and it hits its peak with two-three minutes. If it's I.M. (a shot in a muscle) then it begins working in about 15 minutes and it hits its peak around 45 minutes.