The short version
- If you take insulin or a sulphonylurea alongside your GLP-1, see your doctor before fasting. Low blood sugar is the real risk.
- Dehydration is the main danger for everyone else, especially in Nigerian heat.
- Do not start a new dose or step up during a fast if you can avoid it.
- Protein at suhoor and iftar matters more than usual, because you have fewer chances to eat.
Ramadan, Lent and the long church fasts common across Nigeria all raise the same practical question: what happens to a medicine that already suppresses appetite when you stop eating for most of the day?
For most people without diabetes, fasting on a GLP-1 is manageable with planning. For people using insulin or sulphonylureas, it needs medical input first, because the combination raises the risk of hypoglycaemia.
Timing your injection
These are weekly injections, so you have flexibility that daily medicines do not offer.
- Pick a day and keep it. Changing days repeatedly makes side effects less predictable.
- Inject after the evening meal during a fasting period, so the roughest hours fall while you are able to drink and rest.
- Avoid injecting right before a long fast day if nausea normally hits you hard in the first 24 hours.
Do not escalate mid-fast. Every dose increase brings a fresh round of nausea. Hold your current dose until the fasting period ends, and discuss the timing with your doctor.
Hydration is the real problem
Appetite suppression reduces fluid intake as much as food intake, and people rarely notice. Add a Nigerian afternoon and a fast, and dehydration becomes likely rather than possible.
Between iftar and suhoor, or before and after a church fast, drink deliberately rather than by thirst. Water first, then unsweetened zobo or a light broth. Fizzy drinks make a slow stomach worse, and sweetened drinks undo much of what you are paying the medicine to do.
Eating in a short window
The difficulty is not hunger. It is that you have two short opportunities to eat and almost no appetite during either.
- Protein first, at both meals. Eggs, fish, chicken, beans or moi moi before anything else.
- Break the fast gently. Dates and water, then a pause, then the meal. A large plate arriving at a slow stomach is how vomiting starts.
- Keep suhoor substantial but simple. Pap with milk and eggs, or leftovers from iftar, rather than heavy fried food.
- Avoid the oil-heavy dishes during fasting periods. They sit longest and cause the most reflux overnight.
When to break the fast
Stop fasting and seek help if you become dizzy or confused, if you cannot keep fluids down, if you have severe abdominal pain, or if you have symptoms of low blood sugar such as shaking, sweating and palpitations. Every major faith tradition makes allowance for illness, and a hypoglycaemic episode is an emergency, not a lapse.
Storage while you travel for the holidays
Fasting periods often end in travel, which is where pens get ruined. Unopened pens belong at 2–8°C. Once in use, the leaflets allow Ozempic and Wegovy up to six weeks below 30°C and Mounjaro KwikPen up to 30 days below 30°C. A car boot on the road to the village is not below 30°C.
Carry the pen with you in an insulated bag, never against a frozen block, and refrigerate it as soon as you arrive.
Planning Your Doses Around a Fast
We can help with timing and supply so you are not caught short mid-fast. Dose changes are a conversation for your doctor.
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