Can you drink alcohol before or after donating blood?
Avoid alcohol before you donate and for about 24 hours afterward. Donors who are intoxicated cannot give blood.
Alcohol can complicate a donation. Knowing what to do before and after protects your health.
Before donating
Skip alcohol the night before and the day of your donation if you can. Alcohol:
- Widens blood vessels, raising the risk of dizziness
- Dehydrates you, making the draw harder
- Can lower blood pressure when combined with the loss of blood volume
A donor who is clearly intoxicated cannot give blood that day.
At screening
You may be asked about recent alcohol use. Answer honestly. The health history is confidential and is there to protect you and the patient.
After donating
Your body is rebuilding fluid and nutrients. The American Red Cross recommends avoiding alcohol for 24 hours after donating. Alcohol:
- Interferes with rehydration
- Can intensify lightheadedness and fatigue
Practical tip
If you plan to donate, avoid events with drinking the night before and choose a day when you can rest afterward.
This information is general and does not replace advice from a health professional. Your eligibility is always decided at the donor screening on the day of donation. Rules change, so confirm with the American Red Cross or the blood center where you plan to donate.