Ageing Gracefully • Medication Safety

Things That Can Affect Your Medication

• 102 Not Out • Updated 14 November 2026 • 9 min read

A tablet that works perfectly for years can suddenly behave differently. Not because the tablet changed, but because we did: our kidneys, our food, our other medicines, even the season. This guide lists the everyday things that can change how your medicines work, in plain language, with an India-first view.

In this guide

1. How the ageing body handles medicines
2. Food and drink
3. Other medicines and OTC products
4. Herbs and Ayurvedic supplements
5. Timing, storage and habits
6. Quick reference table
7. India versus the West
8. Guidance for NRI families
9. FAQ

What the evidence says

Older adults are more likely to take several medicines at once (called polypharmacy), and the risk of side effects and interactions rises with every added medicine. Age-related changes in kidney and liver function mean many drugs stay in the body longer. Medication review is widely recommended by geriatric and pharmacy bodies as a core safety step.

Disclaimer: This is general education, not personal medical advice. Never stop, start or change a medicine without speaking to your doctor or pharmacist.

1. How the Ageing Body Handles Medicines

Four quiet changes explain most medication surprises after 60:

Slower kidneys

Many medicines leave the body through urine. When kidney function falls, doses may need to be lower, or a medicine may need to be avoided.

Changed liver work

The liver breaks down many tablets. With age this can slow, so effects last longer.

Less body water

Water-soluble medicines become more concentrated, and dehydration happens faster in summer or illness.

More sensitive brain and heart

Sleeping pills, some painkillers and allergy tablets can cause confusion, dizziness and falls more easily.

Ask your doctor: “Is my kidney function still fine for all my medicines?” A simple creatinine / eGFR test answers a lot.

2. Food and Drink

• Grapefruit and pomelo (chakotra): can raise the level of some cholesterol, blood pressure and heart-rhythm medicines. Ask your pharmacist about your own tablets.
• Green leafy vegetables and warfarin: palak, methi and sarson are rich in vitamin K. You do not have to avoid them, but keep the amount steady from week to week.
• Dairy and calcium: curd, milk and calcium tablets can reduce absorption of some antibiotics and thyroid medicine. Keep a gap as advised.
• Salt, pickles and papad: work against blood pressure tablets and can worsen swelling in heart and kidney patients.
• High-potassium foods: coconut water, banana and tomato need care with some BP tablets and in kidney disease. Check with your doctor first.
• Tea and coffee: strong chai close to iron or thyroid tablets reduces absorption. Too much caffeine can also raise heart rate.
• Alcohol: mixes badly with sleeping pills, painkillers, diabetes medicines and blood thinners, and increases falls.
• Skipped or delayed meals: a real danger with diabetes tablets and insulin because of low blood sugar.

3. Other Medicines and Over-the-Counter Products

Most dangerous interactions come from a medicine added without telling the other doctor.

• Painkillers (NSAIDs) such as ibuprofen, diclofenac and naproxen can strain the kidneys, irritate the stomach, raise blood pressure and increase bleeding with blood thinners.
• Cold and cough products with decongestants can push blood pressure up. Older-style allergy tablets can cause drowsiness and confusion.
• Antacids and acid reducers can change how well other tablets are absorbed.
• Multiple specialists: the cardiologist, nephrologist, diabetologist and orthopaedic doctor may each add something. Someone must see the full picture.
• Same drug, two brand names: taking two brands that contain the same ingredient doubles the dose by accident. Check the generic name on the strip.

4. Herbs and Ayurvedic Supplements

“Natural” does not mean “interaction-free.” Herbs are active substances. In my herb series on this blog I mention interaction cautions for each herb, and the common themes are:

• Giloy and sugar-lowering herbs: may lower blood sugar further when combined with diabetes medicines. Use extra caution in autoimmune disease or after transplant.
• Ashwagandha: may add to sedation and may affect thyroid hormone levels. Tell your doctor if you take thyroid or sleep medicines.
• Licorice (mulethi): can raise blood pressure and lower potassium, which matters with BP tablets and water pills.
• Diuretic herbs such as Punarnava and Gokshura: added to a water pill, they may increase fluid loss. Discuss before combining.
• Garlic, ginger, turmeric and ginkgo supplements: in concentrated capsule form, they may add to bleeding risk with blood thinners.

Rule of thumb: show every herb bottle to your doctor, exactly as you show your tablet strips. Stop herbal products before surgery only as your surgeon advises.

5. Timing, Storage and Daily Habits

• With food or empty stomach: some tablets need food, others work best empty. Thyroid tablets are usually taken on an empty stomach, well before breakfast. Check your own instructions.
• Do not crush or split extended-release (SR/XR/CR) tablets unless the pharmacist says it is safe.
• Dehydration and illness: during fever, vomiting or loose motions, some medicines (water pills, BP tablets, some diabetes tablets, painkillers) may need a temporary pause. Call your doctor the same day; do not decide alone.
• Heat and humidity: do not store medicines in the kitchen, bathroom or a hot car. Keep them cool, dry and away from sunlight. Insulin and some eye drops need the fridge as labelled.
• Expiry and old strips: discard expired medicines safely. Do not keep old prescriptions “just in case.”
• Memory: a weekly pill organiser, phone alarms and a written chart prevent missed or double doses.
• Smoking: changes how the body processes some medicines. Tell the doctor if you smoke or chew tobacco.

6. Quick Reference: Common Clashes

Your medicine	What can interfere	What to do
Blood thinners	Sudden change in leafy greens, painkillers, garlic or ginkgo capsules	Keep diet steady; report every supplement; keep scheduled blood tests
BP tablets	Salt, licorice, NSAIDs, decongestants	Check labels; avoid OTC cold mixes without advice
Diabetes medicines	Skipped meals, alcohol, sugar-lowering herbs	Eat on time; watch for sweating, shakiness, confusion
Thyroid tablets	Calcium, iron, antacids, coffee close to the dose	Take as directed; keep a gap from calcium and iron
Cholesterol tablets	Grapefruit or pomelo (some types)	Ask your pharmacist about your tablet
Some antibiotics	Milk, curd, calcium or iron	Follow the gap stated on the leaflet
Water pills	Dehydration, diuretic herbs, vomiting or diarrhoea	Call the doctor on sick days
Sleep or anxiety pills	Alcohol, allergy tablets, ashwagandha	Never combine without advice; prevent falls

7. India versus the West: Why Care Is Needed Here

Area	India	USA / UK / Canada
Buying medicines	Prescription-only drugs are often sold over the counter in practice	Stricter dispensing; pharmacist counselling is routine
Generic names	Paracetamol, Salbutamol, Adrenaline, Frusemide	Acetaminophen, Albuterol, Epinephrine, Furosemide
Combination tablets	Fixed-dose combinations are very common	Mostly single-ingredient prescribing
Herbal products	Widely used alongside allopathy, rarely listed on the prescription	Sold as supplements; interactions still apply
Affordable generics	Jan Aushadhi stores and generic prescribing	Generics are the default at pharmacies

Practical India tip: keep one updated medicine list in your phone, linked to your ABHA health record if you use it, and show it at every clinic, lab and hospital.

Guidance for NRI Families Managing Parents from Abroad

1. Build one shared medicine list (a shared online sheet works well) with generic names, doses, timings and prescribing doctor.
2. During every India visit, photograph all strips and herbal bottles. Review them with the family doctor or a pharmacist.
3. Convert names: when a Western doctor or hospital asks, use the generic name, not only the Indian brand.
4. Do a weekly video call at pill-organiser time so you can see that the week is set up correctly.
5. Ask for an annual medication review with one trusted doctor who sees the entire list.
6. Carrying or posting medicines across borders: check customs and prescription rules of the destination country first.

When to Act Fast

Call your doctor the same day for new confusion, repeated dizziness or falls, a new rash, unusual swelling, black or bloody stools, unusual bruising or bleeding, very low urine, or sugar readings that are suddenly too high or too low.

Emergency: breathing trouble, chest pain, fainting, severe allergic reaction or unresponsiveness. Call 108 or 112 immediately.

You can also report a suspected side effect through India’s Pharmacovigilance Programme (PvPI) via your doctor or pharmacist.

Frequently Asked Questions

Why do medicines act differently as we grow older?

The kidneys clear medicines more slowly, the liver processes them differently, body water falls and body fat rises. The same dose can stay longer in the body and act more strongly.

Can Ayurvedic herbs and supplements affect my allopathic medicines?

Yes. Herbs such as giloy, ashwagandha and licorice can change blood sugar, blood pressure, thyroid levels or sedation. Always tell your doctor and pharmacist about every herb you take.

Is grapefruit really a problem with tablets?

Grapefruit and pomelo can raise the level of certain medicines, including some cholesterol and blood pressure tablets. Ask your pharmacist whether yours are affected.

What should I do if I miss a dose?

Do not double the next dose unless your doctor has told you to. Check the leaflet or call your pharmacist, because the right answer depends on the medicine.

How often should all my medicines be reviewed?

At least once a year, and after any hospital stay, new prescription or new symptom. Carry a complete written list to every visit.

Keep Your Medicine List Current

Explore more senior health guides, Mediclaim help and Ayurveda references on 102 Not Out, and our tools on Health+Code.

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Happiness always along with life — not the end of life.

Medical disclaimer: This article is for general information and education only. It does not replace advice from your doctor, pharmacist or other qualified health professional. Do not start, stop or change any medicine, herb or supplement based on this article alone.