Can You Donate Blood on Ozempic, Wegovy, Mounjaro or Zepbound?

Yes, in most cases you can donate blood while taking semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro, Zepbound). No GLP-1 drug is on the medication deferral list that US blood centers use, and the American Red Cross says people with diabetes or prediabetes are generally eligible whatever medication they take, as long as they feel well on the day.^[1][2] What decides it is the reason you take the drug and how you feel when you arrive. The exception is a drug you inject without a prescription, such as a research-use vial: the Red Cross asks people who inject drugs not prescribed by a physician to wait three months.^[1]

What the rules say about GLP-1 drugs

US blood centers screen donors with a standard questionnaire and a short list of medications that delay donation. That list, AABB’s Medication Deferral List, was last updated in September 2026. It names blood thinners, antiplatelet drugs, isotretinoin for acne, finasteride and dutasteride, certain immune-suppressing antibodies, HIV prevention drugs and a few others. No GLP-1 drug, and no diabetes drug of any kind, is on it.^[2] AABB’s October 2026 notice about the update added only a deferral for B-cell-depleting antibodies.^[3]

The Red Cross says the same thing in plainer words: in almost all cases medications do not disqualify a donor, and eligibility depends on why the medication was prescribed.^[1] Its list of drugs with waiting periods does not include semaglutide, tirzepatide, liraglutide or dulaglutide.^[1]

Diabetes and insulin

Many people on Ozempic or Mounjaro take them for type 2 diabetes. The Red Cross treats diabetes and prediabetes as compatible with donation when the donor feels well, and says the kind of medication used to manage it usually does not matter.^[1] Insulin is no exception: donors who take any kind of insulin are eligible on the same condition.^[1]

“Feeling well” is the operative phrase. A donor with blood sugar swinging high or low on the day, or with symptoms of a diabetes complication, may be turned away for the day by the staff, under the federal rule that a donor must be in good health and that staff must ask about current illness and certain medications.^[4] Zepbound’s label reports a higher rate of low blood sugar in people who also take a sulfonylurea, a risk covered in GLP-1 drugs and low blood sugar.^[7]

Compounded and research-use GLP-1 drugs

A compounded semaglutide or tirzepatide prescribed by a clinician is a prescribed drug, and nothing on the deferral list names it. Say on the questionnaire what you take and that it is compounded; the center’s staff can decide.^[2]

Vials bought online as “research chemicals” are different. The Red Cross asks donors to wait three months after using needles to inject drugs that were not prescribed by a physician, a rule tied to the risk of hepatitis and HIV.^[1] An unprescribed retatrutide, tirzepatide or peptide vial falls into that wording. Drugs still in trials appear on the AABB list as experimental medication, with the waiting period set by the center’s medical director.^[2] What those online vials are, and why FDA treats them as unapproved drugs, is covered in buying tirzepatide as a research chemical.

Drugs taken alongside a GLP-1 that do matter

The GLP-1 drug itself rarely matters, but some medicines people take with it do. Prescription blood thinners such as warfarin, apixaban (Eliquis) and rivaroxaban (Xarelto) rule out donation while you take them, because your blood will not clot normally at the needle site.^[1] Aspirin and some antiplatelet drugs do not affect whole-blood donation but require a wait before giving platelets.^[1] How blood thinners interact with GLP-1 drugs is covered in blood thinners and a GLP-1.

Practical points if you donate on a GLP-1 drug

The usual advice to donors is to drink an extra 16 ounces of water before the appointment and to eat a healthy meal beforehand.^[5] On a GLP-1 drug, appetite is low and small meals are common, so that meal is easy to skip. A donor who has eaten little and drunk little is more likely to feel faint.

• Eat a real meal and drink fluids before you go, even if you are not hungry.
• Avoid donating on a day with nausea, vomiting or diarrhea. Zepbound’s label notes that most reported kidney injuries on these drugs happened in people who became dehydrated from stomach side effects, and giving blood removes fluid too.^[7]
• Consider waiting a few days after starting or raising a dose; the label asks for closer watch on fluid loss during those weeks.^[7]
• Meet the usual criteria: at least 110 pounds, a hemoglobin of at least 12.5 g/dL for women and 13.0 g/dL for men, and blood pressure between 90/50 and 180/100.^[1] The thresholds are the same on a GLP-1 drug as off one.
• Bring a list of every prescription and over-the-counter medication you take; staff will ask.^[5]

If you feel lightheaded on a GLP-1 drug in daily life, that is worth sorting out before donating; causes are covered in dizziness and blood pressure pills on a GLP-1.

Platelets and plasma

The same medication rules apply to platelet and plasma donation at blood centers. The AABB list has entries that apply only to platelets, such as aspirin and clopidogrel, but none for GLP-1 drugs.^[2] At the Red Cross, plasma can be given every 28 days, up to 13 times a year, and platelets as often as every 7 days.^[6][1]

Paid plasma centers run their own screening under the same federal donor-eligibility rule, which requires them to ask about medications and current illness.^[4] None of the large plasma companies publishes a GLP-1 policy that we could find on its own site, so call the center before you go, name the drug and say whether it is brand or compounded.

Is a GLP-1 drug in donated blood a risk to the recipient?

No study has looked at this, and the agencies that write donor rules have not deferred GLP-1 users for it. The deferral list covers drugs that affect clotting or platelets, HIV prevention and treatment, a group of acne, hair-loss, prostate, cancer and immune drugs, and experimental medicines.^[2] GLP-1 drugs are not among them.