Chronic medicines treat conditions that usually have no symptoms, which creates a particular trap: the medicine is the only thing you notice, so it feels like the problem. High blood pressure, raised cholesterol and early diabetes are largely silent, and stopping treatment often feels like nothing much has happened, right up until it does.
Do not stop a chronic medicine on your own. There is almost always an option between continuing exactly as you are and stopping altogether.
Common side effects during long-term use
The effects that most often prompt people to consider stopping are muscle aches on statins, dizziness or cough on blood pressure medicines, digestive effects on metformin, and tiredness across several groups.
Most are addressable. A different dose, a different medicine in the same class, or a change in timing resolves a large proportion of them. See managing chronic medication side effects and whether they go away.
Serious or persistent symptoms to discuss with a clinician
Some chronic medicines are genuinely dangerous to stop suddenly:
- Beta blockers. Stopping abruptly can cause a rebound rise in heart rate and blood pressure, and in people with heart disease can provoke chest pain. See beta blocker side effects.
- Corticosteroids such as prednisone. After more than a short course the body needs a gradual reduction. See prednisone side effects.
- Epilepsy medicines. Stopping can trigger seizures.
- Blood thinners. Stopping removes protection against clots and stroke.
- Insulin and diabetes medicines. Stopping can lead to dangerously high blood sugar.
- Thyroid medicine. Symptoms return gradually and may not be obvious for weeks.
Get urgent help if you have stopped something and develop chest pain, severe breathlessness, one-sided weakness or difficulty speaking, a seizure, or very high blood sugar with thirst and vomiting.
Dose changes, missed doses and monitoring tests
A trial period off a medicine is sometimes a legitimate option, done deliberately with monitoring arranged, so that its effect can actually be judged. That is a different thing from stopping and hoping.
Ask what monitoring you are due, since results often inform whether a medicine is still needed at the same dose. Weight loss, dietary change or improved fitness genuinely can reduce what is required, but that is a decision made against readings rather than assumed.
Also ask for sick day advice: some chronic medicines need pausing temporarily during vomiting, diarrhoea or dehydration, and knowing that in advance is more useful than working it out while unwell.
Interactions with OTC medicines and supplements
Before concluding a chronic medicine is causing a problem, check what else you are taking. A pharmacy product or supplement started around the same time is a common and easily missed explanation. See OTC medicines with chronic medication and chronic medication and supplements.
Cost is also a legitimate reason people stop, and one worth raising directly. Generic alternatives or a different agent in the same class are often available, and a prescriber cannot address a problem they do not know about.
What to ask your doctor before changing treatment
- What is this medicine actually preventing, and what changes if I stop?
- Is my side effect likely to settle, or is it worth changing medicine?
- Is there an alternative in the same class that suits me better?
- Is a supervised trial off it reasonable, and what would we monitor?
- Is this one that must never be stopped suddenly?
- What should I do about it if I get a stomach bug?
Related chronic medication guides
- Chronic medication side effects
- Managing chronic medication side effects
- Side effects after a dose change
- Should I stop taking my medicine
- Report a side effect in South Africa
Medical Disclaimer: This content is for informational and educational purposes only and does not constitute medical diagnosis, prescription, or professional advice. Always read the patient information leaflet and consult a qualified doctor or pharmacist regarding any medicine or health concern.