Common Medication Mistakes Patients Should Avoid

Every day in India, millions of people managing chronic conditions such as diabetes, high blood pressure, thyroid disorders, and high cholesterol rely on daily medicines to stay healthy. Yet many patients unintentionally make medication mistakes, such as taking a medicine at the wrong time, stopping treatment too early, mixing medicines without checking interactions, or adjusting doses on their own. These mistakes are often not due to negligence, but because important instructions about how to take medicines safely and effectively are not always clearly explained. Understanding the most common medication mistakes can help improve treatment outcomes, reduce side effects, and prevent avoidable health complications.

Common Medication Mistakes

1. Skipping doses or stopping medicine too early

The most common mistake is missing doses, taking medicine irregularly, or stopping treatment as soon as symptoms improve. This can make the medicine less effective and may allow the underlying condition to remain uncontrolled or return. For example, a patient with high blood pressure who stops taking medicines such as telmisartan or amlodipine may experience a rise in blood pressure within days, increasing the risk of heart-related complications. Similarly, people with diabetes who skip insulin doses may develop dangerously high blood sugar levels, which in severe cases can lead to diabetic ketoacidosis (DKA). With antibiotics, stopping early may allow surviving bacteria to multiply and contribute to antibiotic resistance, making future infections harder to treat [1], [2].

2. Taking a higher dose than prescribed

Some patients take more doses than prescribed because they think it will work faster or be more effective. Taking too much can increase the risk of side effects, toxic drug levels, organ damage, excessive sedation, changes in blood pressure, or other serious complications depending on the medicine involved [1], [3]. Avoid adjusting your dose without consulting your doctor.

3. Taking medicine at the wrong time

Wrong timing is another frequent medication mistake. Some medicines need to be taken at specific times of day, at evenly spaced intervals, with food, or on an empty stomach. If not taken on time, it can reduce their effectiveness, increase side effects, or affect how the body absorbs the medicine [1], [3]. For example, levothyroxine tablets such as Thyronorm are usually recommended to be taken on an empty stomach, ideally in the morning before food, because meals can interfere with absorption. Diuretics such as torsemide are generally better taken earlier in the day, as taking them late in the evening may lead to frequent urination during the night and disturb sleep. Certain cholesterol medicines, such as atorvastatin and rosuvastatin, can usually be taken at any consistent time of day unless your doctor advises otherwise.

4. Mixing medicines without checking for interactions

Prescription medicines, over-the-counter medicines, vitamins, herbal products, and supplements can interact with one another. These interactions may make a medicine less effective or increase the risk of side effects, bleeding, drowsiness, changes in blood pressure, or other harmful reactions [3], [2].

For example, the use of painkillers such as ibuprofen together with blood pressure medicines, diuretics, or certain kidney medicines can reduce blood flow to the kidneys and increase the risk of kidney damage, especially in older adults or people with existing kidney disease.

5. Self-adjusting or self-prescribing

Changing the dose, timing, or duration of a medicine without professional guidance is again a very common practice in India, particularly with antibiotics, painkillers, and steroids. Some people reuse old prescriptions, take medicines recommended by friends or family, or stop and restart medicines on their own depending on symptoms. However, this can lead to inappropriate treatment, delayed diagnosis, side effects, antibiotic resistance, and harmful medication interactions because medicines are prescribed based on an individual’s health condition, medical history, and current treatment plan [3], [2].

6. Crushing, chewing, or opening tablets and capsules improperly

A few individuals crush or chew the tablets that were meant to be swallowed whole. This could modify how the medicine is released and absorbed into the body, possibly reducing its effectiveness, increasing adverse reactions, irritating the stomach lining, or releasing excess amounts of the medicine at once [3]. For example, sustained-release or extended-release tablets are specially designed to release the medicine slowly over time. Crushing them may release the entire dose at once, increasing the risk of side effects or toxicity.

7. Not reading the label carefully or misreading it

The medication labels include directions on dosage, ingredients, storage, and warning signs. However, patients may accidentally misread labels, confuse medicines with similar packaging, or misunderstand instructions due to language barriers or difficulty reading small print. This can lead to taking the wrong medicine, incorrect doses, duplicate ingredients, or unsafe combinations, increasing the risk of side effects or overdose. All these errors will increase the likelihood of overdose and side effects from medications [1], [4]. To reduce this risk, always read the label in good lighting, wear glasses if needed, and ask your doctor to explain any instructions that are unclear.

8. Storing medicines incorrectly

Medicines are often stored in places exposed to heat and humidity, such as kitchen shelves near the stove, window ledges, or inside parked vehicles during hot Indian summers. Excess heat, moisture, and direct sunlight can reduce the effectiveness and stability of certain medicines [1]. Improperly stored insulin, especially when exposed to excessive heat, freezing temperatures, or direct sunlight, can lose its effectiveness and may not control blood sugar properly. This can lead to persistently high blood glucose levels and increase the risk of serious diabetes related complications. Similarly, thyroid medicines such as Thyronorm may also become less stable if stored improperly for long periods. Medicines should ideally be kept in a cool, dry place away from direct heat and sunlight unless the label states otherwise.

Expert Tip: Use a dedicated airtight box in a cool, dark linen closet or a high shelf in the pantry.

9. Not telling your doctor or pharmacist everything you take

If you do not share a complete list of all medicines and health products you use, important precautions can be missed. This includes prescription medicines, over-the-counter products, vitamins, supplements, Ayurvedic medicines, herbal remedies, and homeopathic preparations. In India, many patients do not mention traditional or alternative medicines to their doctor, assuming they are completely safe or unrelated to the treatment. These products can still interact with prescription medicines, increase side effects, or affect how treatments work. Providing a complete and updated medication list helps doctors identify possible interactions, avoid duplicate treatments, and prescribe medicines more safely [3].

10. Using the wrong measuring device for liquid medicine

A study published in Pediatrics found that 80% of parents made at least one dosing error when using kitchen spoons. A standard teaspoon can vary from 2 mL to 9 mL, which may lead to underdosing or overdosing. Always use a calibrated oral syringe for liquid medicines. If your pharmacist did not provide one, ask for it specifically.

When to contact a doctor immediately

• If you experience severe side effects such as rash, swelling, or difficulty breathing.
• If you suspect an overdose.
• If you have missed multiple doses of critical medication.
• If you experience any unusual symptoms after starting a new medicine.

How to Help Prevent Medication Mistakes

Understanding the purpose and safety information for each medicine will help you use the medicine more correctly [1], [3]. Ask your doctor why you are taking that medicine, how long you need to take it, its common side effects, and possible signs of overdose. This will help lessen the instances of mistakes. Here’s how you can prevent the most common medication mistakes:

• Keep a complete list of all your medicines, vitamins, herbal products, and other supplements. Mention the name, dose, and frequency of the medication, and make sure every doctor you consult has the same updated list [3].
• Follow label directions exactly and take medicines only as instructed by a doctor or pharmacist. Do not change the dose, schedule, or duration on your own, even if you feel better or think the medicine is not working quickly enough [1], [3].
• Take medicine at the same time as instructed by your doctor. Some medications are taken before meals, after meals, on an empty stomach, or at bedtime. Using alarms and reminders on a phone can help you take medicines on time [1].
• Read the label carefully every time before taking a medicine. Turn on a light, wear your eyeglasses if you use them, and check the medicine name, active ingredient, strength, and instructions before each dose [1], [4].
• Ask your doctor questions if any instructions are unclear. If you do not understand how to take a medicine, whether it can be crushed, whether it should be taken with food, or how long to continue it, speak with a doctor or pharmacist before taking it [1], [3].
• Get any monitoring tests your doctor recommends. Some medicines require blood tests or other follow-up checks to make sure they are working properly and not causing harm [3]. For example, diabetes patients using insulin or oral antidiabetic tablets may need blood glucose or HbA1c tests for dose adjustment, people taking warfarin usually need regular INR blood tests to check clotting levels, and those taking levothyroxine may need thyroid function tests to confirm which dose is suitable.
• Check for interactions before combining medicines, vitamins, supplements, or herbal products. It is important to know which foods, medicines, or supplements may interact with your treatment and affect safety or effectiveness [2], [3].
• Lock the safety cap after every use and return medicines immediately to their storage place. Store medicines correctly in a cool, dry place away from excess heat, humidity, and direct light unless the label says otherwise.

Quick Safety Tips

• Use reminders or alarms for doses.
• Keep medicines in original packaging.
• Never share prescription medicines.

Conclusion

Many medication mistakes are preventable with awareness, attention, and clear communication with your doctor. Simple habits, such as taking medicines consistently, checking labels carefully, storing medicines properly, and asking questions when instructions are unclear, can significantly improve treatment safety and effectiveness.

A good place to start is by maintaining an updated list of every medicine you take, including prescription medicines, over-the-counter products, Ayurvedic preparations, herbal supplements, and homeopathic remedies, and carrying it to your doctor appointments. This becomes even more important for elderly patients and people managing multiple chronic conditions, where caregivers and family members often play a key role in organising medicines, tracking schedules, and helping prevent unwanted medication mistakes.

DISCLAIMER: This blog is provided for general informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Every patient’s situation is unique. Always consult your doctor or a qualified healthcare professional before making any changes to your medication routine.

References

[1] Medication safety and your health. (2024, November 18). Medication Safety Program. Centers for Disease Control and Prevention. https://www.cdc.gov/medication-safety/about/index.html

[2] World Health Organization. (2017). Medication without harm: WHO global patient safety challenge. World Health Organization. https://www.who.int/initiatives/medication-without-harm

[3] National Library of Medicine. (n.d.). Medication errors. MedlinePlus. https://medlineplus.gov/medicationerrors.html

[4] Medication safety for parents & caregivers | Blogs | CDC. (2022, April 25). Safe Healthcare Blog. Centers for Disease Control and Prevention. https://blogs.cdc.gov/safehealthcare/medication-safety-for-parents-caregivers/

[5] Yin, H. S., Parker, R. M., Sanders, L. M., Mendelsohn, A., Dreyer, B. P., Bailey, S. C., Patel, D. A., Jimenez, J. J., Kim, K. A., Jacobson, K., Smith, M. C., Hedlund, L., Meyers, N., McFadden, T., & Wolf, M. S. (2017). Pictograms, units and dosing tools, and parent medication errors: a randomized study. PEDIATRICS, 140(1). https://doi.org/10.1542/peds.2016-3237