Metformin Beyond Diabetes
Most of us take medicines without a second thought. A headache tablet, a course of antibiotics, a daily blood pressure pill or a vaccine. We trust that the medicine contains exactly what the label says, in the right amount, free from harmful contaminants and capable of doing its job. That trust is built on an enormous amount of work that happens long before a product reaches a pharmacy shelf.
Quality control is at the heart of pharmaceutical manufacturing. Every batch of medicine must be tested, checked and documented to make sure it meets strict standards. Specialist laboratories providing pharmaceutical analytical testing play a vital role in that process, using sophisticated techniques to analyse raw materials, finished products and stability samples.
Why quality control matters
Medicines are designed to have precise effects on the body. Too little of an active ingredient may make a medicine ineffective. Too much could cause side effects or harm. Contamination with microbes, impurities or foreign substances can create serious health risks.
Quality control helps ensure medicines are safe, effective and consistent from batch to batch. A tablet bought today should perform exactly like one bought six months ago. Patients and healthcare professionals rely on that consistency.
In Australia, the Therapeutic Goods Administration regulates medicines and requires manufacturers to comply with Good Manufacturing Practice standards. These standards cover everything from facilities and equipment to staff training, documentation and testing.
Testing starts with raw materials
Quality control begins before manufacturing even starts. Raw materials, including active pharmaceutical ingredients and excipients, must be tested to confirm their identity, purity and quality.
Excipients are the inactive ingredients that help form tablets, capsules, liquids and other dosage forms. Although they don’t provide the therapeutic effect, they must still meet quality standards because they can influence how a medicine is absorbed, how stable it is and how it behaves during manufacturing.
Suppliers are also assessed and approved to ensure materials come from reliable sources.
Checking during and after manufacturing
Throughout manufacturing, in-process testing helps ensure production stays on track. Tests may check tablet weight, hardness, thickness, disintegration, moisture content and blend uniformity. Detecting problems early allows manufacturers to correct issues before an entire batch is affected.
Once manufacturing is complete, finished products undergo extensive testing before release. Common tests include identity testing to confirm the correct active ingredient is present, assay testing to measure how much active ingredient each dose contains and content uniformity testing to ensure each tablet or capsule contains a consistent dose.
Dissolution testing examines how quickly a medicine dissolves, which can affect how it’s absorbed in the body. Impurity testing identifies and measures unwanted substances. Microbiological testing checks for bacteria, yeasts, moulds and other contaminants where relevant.
Laboratories use advanced instruments such as high-performance liquid chromatography, gas chromatography, mass spectrometry and spectroscopy to obtain accurate, reliable results.
Stability testing and documentation
Medicines don’t stay the same forever. Over time, they can degrade due to exposure to heat, light, humidity and oxygen. Stability testing helps determine how long a medicine remains safe and effective under specified storage conditions.
Samples are stored under controlled conditions and tested at intervals to monitor changes in potency, impurities, appearance and other quality attributes. The results support expiry dates and storage instructions printed on packaging.
In pharmaceutical quality control, if something isn’t documented, it effectively didn’t happen. Every test, result, deviation and corrective action must be recorded accurately. Laboratories follow validated methods, calibrate equipment regularly and maintain detailed records. This traceability allows manufacturers and regulators to investigate problems, identify root causes and demonstrate compliance with quality standards. Quality assurance teams review processes and results to make sure procedures are followed correctly and products meet specifications before release.
The role of specialist laboratories
Some pharmaceutical companies perform testing in-house, while others work with external laboratories that specialise in analytical services. These laboratories may support research and development, clinical trials, routine batch testing, stability studies and method development.
Partnering with experienced laboratories can give companies access to specialised expertise, advanced equipment and additional capacity without the cost of building and maintaining their own facilities.
When patients take a medicine, they rarely see the scientists, technicians and quality professionals behind it. Yet their work underpins the safety and effectiveness of every dose. Through rigorous testing, careful documentation and strict regulation, quality control ensures that the medicines we rely on are worthy of the trust we place in them.
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