Assalamualikum, sir

1. The major advantage of the intramuscular route of drug administration is that it delivers the medication directly into the central area of a specific muscle which provides rapid and uniform absorption of the drug.
2. As compared to the oral and subcutaneous routes it offers rapid onset of action.
3. It is suitable to introduce a large amount of the drug compared to the subcutaneous route.
4. The intramuscular route has efficacy and potency compared to other parenteral routes of drug administration.
5. It also avoids gastric factors that control the absorption of the medication.
6. As compared with the intravenous route it allows for slow, prolonged, and sustained release of the drug.
7. The intramuscular route avoids the gastrointestinal tract and first-pass metabolism.
8. It is suitable for those drugs who not recommended for other routes of administration.