Every year, millions of people living with a chronic condition choose to fast during Ramadan. For many it is perfectly safe. For others the risk is real — and it is not measured by willpower, but by health status and current medication. What all uneventful fasts have in common is that they were planned in advance.

Why an appointment before the month matters

The ideal window is 6 to 8 weeks before Ramadan begins. That lead time allows three things that cannot be improvised in the first week: assessing your actual risk, changing a regimen and checking that the new schedule is well tolerated, and practising the monitoring you will need.

The appointment should produce a written plan: which medicines at which time, which numbers to watch, and the threshold at which you break the fast. Without that plan, the temptation is simply to skip the midday doses — sometimes harmless, sometimes dangerous.

When it is safer not to fast

Some situations carry a high risk, and postponing the fast is medically justified:

  • type 1 diabetes, or poorly controlled diabetes with frequent or unrecognised hypoglycaemia;
  • recent ketoacidosis, hypoglycaemic coma or hospital admission for loss of control;
  • advanced kidney disease, or any condition requiring high fluid intake;
  • heart attack, stroke or cardiac surgery in the preceding months;
  • pregnancy complicated by diabetes or high blood pressure;
  • narrow therapeutic index drugs that require strict timing.

This is not an automatic verdict: it identifies situations where the decision must be a medical one, taken with your own doctor, factoring in the real length of the fast and the season.

Diabetes: the most delicate case

Fasting exposes you to two opposite dangers. Hypoglycaemia late in the day, particularly on insulin or sulfonylureas. Hyperglycaemia after iftar, when the fast is broken on pastries and sweet drinks.

A few constants:

  • Never skip suhoor, and take it as late as possible before dawn.
  • Favour slowly digested foods at suhoor: wholegrains, pulses, dairy, eggs.
  • Break the fast gradually — dates, water, soup, then the meal — rather than all at once.
  • Drink generously between iftar and suhoor, avoiding very sweet drinks and excessive tea.
  • Move intense exercise away from the hours just before iftar and from the middle of the day.

Glucose monitoring is essential, especially in the middle and at the end of the day. Contrary to a widespread belief, a finger-prick glucose test does not break the fast — this is the position of the religious authorities consulted on the question.

Thresholds that require breaking the fast

Break the fast immediately and take fast-acting sugar if:

  • blood glucose falls below 70 mg/dl (3.9 mmol/l), or below 80 mg/dl early in the day;
  • you feel sweating, shaking, dizziness, sudden weakness, confusion or palpitations;
  • blood glucose rises above 300 mg/dl (16.7 mmol/l);
  • you show signs of severe dehydration: very dry mouth, very dark or absent urine, faintness on standing.

Breaking the fast in those circumstances is not a failure: it is the recommended course of action, and illness is explicitly provided for in religious rulings.

Blood pressure and heart medication

Most antihypertensives can be moved to iftar or suhoor. Two cautions: diuretics, which increase the risk of dehydration in hot weather and often need adjusting, and twice-daily regimens, which are split between the evening and pre-dawn meals. Keep measuring your blood pressure — an excessive drop with dizziness on standing calls for an adjustment.

Medicines taken at fixed times

Some drugs tolerate schedule shifts poorly: anticoagulants, antiepileptics, thyroid medication, immunosuppressants, HIV and tuberculosis treatments. These must never be rescheduled by guesswork. In several cases, a once-daily extended-release form makes fasting possible without risk — exactly the kind of change that is decided before the month starts.

What does not break the fast

Many essential treatments are compatible with fasting under the majority religious view: non-nutritive subcutaneous or intramuscular injections, eye drops, ear drops, skin creams and patches, nasal sprays, oxygen. When in doubt, ask both your doctor and a religious reference — rather than stopping a necessary treatment on your own.

Planning the month with a doctor

A medication review needs no physical examination: it rests on your current prescription, your latest results and your routine. It is therefore well suited to a remote consultation, including a mid-month adjustment if your numbers drift. You can book an appointment with a doctor or see the available practitioners.