How to Safely Manage Your Medications While Fasting: A Pharmacist's Guide for Lent and Ramadan

If you started fasting today — whether for Christian Lent or Muslim Ramadan — and you are taking medications, this guide is for you. As a pharmacist, I want to make sure your fast does not compromise your health or the effectiveness of your treatment.

Why Fasting Changes How Medications Work

When you fast, several things change in your body: your stomach is empty for longer periods, your fluid intake may be restricted, your meal timing shifts dramatically, and your blood sugar and blood pressure patterns change. Each of these changes can affect how your medications are absorbed, distributed, and eliminated.

Medications That Require Special Attention During Fasting

Diabetes Medications

This is the highest-risk category. Medications like glipizide, glibenclamide, and insulin are designed to lower blood sugar — but if you are not eating, they can push your blood sugar dangerously low (hypoglycemia). Signs include shakiness, sweating, confusion, and in severe cases, loss of consciousness.

What to do: Do not stop your diabetes medication without speaking to your doctor or pharmacist first. Your doses may need to be adjusted or timed differently around your eating windows.

Blood Pressure Medications

Fasting can naturally lower blood pressure, especially if you are also restricting fluids. Combined with blood pressure medications, this can cause dizziness, fainting, or falls — particularly in older adults.

What to do: Monitor your blood pressure daily during your fast. If readings are consistently low (below 100/60), contact your healthcare provider.

NSAIDs and Stomach-Irritating Medications

Medications like ibuprofen, aspirin, and naproxen should always be taken with food. Taking them on an empty stomach during a fast significantly increases the risk of stomach ulcers and gastrointestinal bleeding.

What to do: Take these medications with your pre-fast meal (Suhoor) or your meal when breaking the fast (Iftar). If you cannot time them with food, speak to your pharmacist about alternatives.

Medications That Must Be Taken With Food

Several medications require food for proper absorption or to prevent side effects: metformin (nausea without food), certain antibiotics, and some antifungal medications. Check with your pharmacist which of your medications fall into this category.

Medications That Are Generally Safe During Fasting

Most once-daily medications — including many blood pressure drugs, thyroid medications, and cholesterol medications — can be safely taken with water during a fast without food. However, timing may need to shift to align with your eating windows.

Practical Tips for Fasting Safely

Stay well hydrated during permitted eating hours. Take your medications with your pre-fast or post-fast meal whenever possible. Keep a blood sugar or blood pressure log if you are monitoring these. Carry a fast-acting sugar source (glucose tablets, juice) if you are on diabetes medications. And most importantly, do not stop any medication abruptly without medical guidance — speak to your pharmacist first.

Source: PharmaPlan Systems clinical review. This guide is for educational purposes. Always consult your pharmacist or physician before adjusting your medication schedule during a fast.