Question

Why shouldn't we rub after an injection?

Answer 1

The reason why we shouldn't rub after an injection is because rubbing or massaging the injection site can sometimes cause the drug that was injected to back up through the subcutaneous tissue that is present in the deepest layer of your skin and make the drug that was injected less effective.

So as a safety measure it's best to avoid massages or rubbing of the injection site.

The injection type that works fastest are IV or intravenous injections.

IV or intravenous injections deliver the medication directly into your bloodstream for an immediate effect.

The IV or intravenous injection bypasses the absorption barriers and makes it superior to IM or intramuscular or SC or subcutaneous injections for rapid onset.

And in emergency situations, IO infusions or intraosseous infusions into your bone marrow are also a similarly fast alternative when your veins are not accessible.

IV or intravenous injections deliver the medication direct to the vein and provides you with immediate and 100 percent bioavailability.

IM or intramuscular injections are delivered into your muscle, which also has a high vascularity for quick absorption, which is usually behind IV.

SC or subcutaneous injections are injected into fat, although they are slower in absorption due to lower blood supply.

And ID injections or intradermal injections are injected between the layers of the skin and have the slowest absorption.

IV is the fastest route for certain medications such as epinephrine, but IM injections can also be chosen for speed and convenience when compared to setting up an IV.

Intramuscular (IM) injections generally absorb faster than subcutaneous (SubQ) injections because muscle tissue has a richer blood supply, leading to quicker drug distribution into the bloodstream compared to the slower, more stable absorption from the fatty tissue of SubQ injections.

IM injections are preferred for rapid action, while SubQ offers a slower, steadier release, though absorption rates can vary by drug, site, and individual factors like body fat.

Intramuscular injections reach peak concentration sooner and are best for drugs that require quick action or solutions, which may irritate SubQ tissue.