When patients take their medicine, they typically assume that swallowing the pill is the last step before it takes effect. But, in reality, there is an intricate process of physiology and pharmacology that occurs between taking the medicine orally and the point when it actually works. In one sense, one of the most significant events that occur during this time is the release of the active ingredient from the tablet into body fluids. It is how fast this release is, in part, that determines how well the medicine will work.
Knowing and measuring the rate at which the medicine is released is important for the safety and consistency of a medication for healthcare professionals, researchers, and drug manufacturers.
What Happens After You Swallow a Pill?
For most drugs, they will not be fully active until they have dissolved in gastrointestinal fluids, allowing the active pharmaceutical ingredient to be absorbed into the blood stream. If a drug is released too slowly, it might not achieve the necessary dose level to be therapeutically active in the body. If the drug is released too fast, there could be more than enough released in the body, which could have increased risks for side effects.
The release rate of the drug is influenced by formulation factors (both in the way the medicine is made and any coating on the pill), manufacturing factors, the actual properties of the drug molecule, and other factors. All of these can be used by pharmaceutical scientists in a laboratory to estimate drug performance. Dissolution is often used as a quality control test for solid dosage forms, because the higher the dissolution of the tablet, the greater the chance for its contents to be absorbed into the body.
Consistency is Crucial
Every patient takes medication expecting that every pill they consume is identical to the one they took the day before, the week before, or the month before. A drug must act consistently for each dose.
The way pharmaceutical manufacturers ensure consistent drug release is through rigid testing during research and development, as well as during routine manufacturing of every batch of drug that is released to patients. A minor change to the raw materials, the force applied during tablet pressing, or a variation in particle size or tablet coating could alter how a tablet behaves when taken. Regulatory agencies demand consistency, and the comparative dissolution profiles of different production batches is often how it is verified.
The Importance of Tablet Dissolution Studies
A critical quality control method for pharmaceuticals is tablet dissolution testing, which measures the dissolution rate, the speed at which a drug is released from a solid dosage form into solution. In a laboratory setting, this process is carried out using specialized equipment and carefully prepared liquids that simulate the conditions of the human gastrointestinal tract under controlled temperature and agitation levels. Samples are collected at predetermined time points, and the amount of dissolved drug is then quantified using validated analytical techniques.
These tests provide useful data for drug product development as well as for ongoing monitoring of drug products on the market.
More than Just a Manufacturing Requirement
Although pharmaceutical manufacturing is directly related to testing drug release rates from tablets, testing this is not just a way to keep manufacturers in check. It helps providers and patients by reducing inter-dose and inter-patient variability. The reliability in drug performance measured by dissolution is especially important when developing and testing a generic drug product since its equivalence is determined relative to the reference drug.
Factors That Affect Drug Release
Factors that can influence a tablet’s ability to release its drug content include:
* Particle size of the active ingredient
* Type and quantity of excipients present in the formulation
* Force of tablet compression during manufacturing
* Coatings and protective layers on the tablet
* Temperature and humidity in which the product is stored
* Nature of the dissolution medium
The extensive work by pharmaceutical researchers to optimize all of these formulation aspects and how a drug is released from the tablet can contribute to predictable performance regardless of manufacturing location or batch number.
Advances in Pharmaceutical Quality Control
To ensure a reliable and efficient product development process, laboratories are utilizing sophisticated automated equipment to perform tests and analyze data. This automation helps to reduce the variability of laboratory tests and ensures increased reliability in drug release information. Furthermore, an increased emphasis on Quality by Design (QbD) has focused efforts to predict and control drug release based on variables in the development process, rather than relying on final product testing. Tablet dissolution is a central part of this strategy because it measures how well the drug release parameters are controlled based on its design.
The Road Ahead
As novel forms of medicines and therapies continue to evolve, particularly personalized medicines and the advent of advanced delivery systems, testing the drug release will become more challenging and important than ever. Modified release or combinations of different drugs will continue to require more sophisticated and well-thought out methods of evaluating the dosage form’s drug release capabilities. The results are often invisibly incorporated into each reliable pill that patients take from the pharmacy, and thousands of hours are invested in making them safe and dependable. Effective healthcare requires not just discovery, but also quality-controlled, predictable, and reliable drugs.
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