Osmotic Activity of Drugs is an Important Factor of Their Local Action at the Injection Site: What We Don't Use to Prevent Post-Injection Abscesses

It is established that very few modern high-quality drugs in the dosage form "Solution for injection" have isoosmotic activity in the range of 280-300 mosmol/l of water. The main part of solutions for injection is hypotonic or hypertonic solutions, which can have osmotic activity in the range of 0 - 4000 mosmol/l of water. The reason for this was that the osmotic activity of drugs is not included in the list of controlled indicators of drugs quality, so it is not subject to control. It is shown that the osmotic activity of drug solutions increases with an increase in the total concentration of all dissolved ingredients present in the solution.  It was found that an excessively high concentration of the drug in the solution gives it an excessively large hyperosmotic activity, which can cause a local irritant and cauterizing effect at the injection sites due to dehydration of the cells. Therefore, to exclude post-injection abscesses, it is proposed to dilute the hypertonic drug with water for injection until it is given isotonic activity.