Medications That Raise Blood Sugar
Several common prescriptions affect glucose. What they are, how much it matters, and why the answer is never to stop one.
If your numbers changed and your eating didn't, this list is worth reading — with one instruction attached to all of it.
The instruction first
Do not stop or reduce any prescribed medication because of a glucose reading. Every drug here was prescribed for a reason that generally outweighs its effect on glucose. What's appropriate is a conversation, not a decision.
The main ones
Corticosteroids — prednisone and similar. The largest effect on this list by some distance, and often dramatic. Typically worse in the afternoon and evening with morning dosing. Usually reversible as the dose reduces.
Statins. A small, well-documented increase in glucose and in new diabetes diagnoses. The cardiovascular benefit is substantially larger, and guidelines specifically recommend continuing.
Thiazide diuretics, used for blood pressure. A modest effect, more pronounced at higher doses, and often manageable by dose adjustment or a different agent.
Beta blockers, particularly older non-selective ones. Two effects worth knowing: a modest rise in glucose, and — more importantly — they can mask the warning symptoms of hypoglycemia, which matters if you take insulin or a sulfonylurea.
Some antipsychotics, particularly second-generation agents, which have well-recognized metabolic effects including weight gain and glucose elevation. Monitoring is standard practice and often not done.
Some antidepressants, with variation between them.
Certain immunosuppressants, after transplant.
Some HIV medications.
Niacin at high doses.
What to actually do
Know what you're taking and check. Ask your pharmacist directly — they're free, expert on precisely this, and consistently underused.
Tell whoever manages your glucose about everything you take, including things prescribed by other specialists. This is where things fall between clinicians.
If a new medication coincided with a change in your numbers, say so. That's useful clinical information and it may change the choice within a drug class.
Ask whether an alternative exists where the effect is meaningful. Frequently one does, particularly for blood pressure.
Monitor at the right time. With steroids specifically, afternoon readings are more informative than fasting.
The framing
These effects are usually small relative to the reason for the prescription. Steroids for a serious flare, statins for cardiovascular risk, antipsychotics for a condition that needs treating — the trade is generally worth making.
Knowing about it means monitoring appropriately rather than being alarmed.
Try this week: take your full medication list to a pharmacist and ask which affect blood sugar. It's a ten-minute conversation and it's free.
Education, not medical advice. Never stop or adjust prescribed medication without your prescriber.