Does drinking alcohol stop you from donating blood?
Not permanently. You cannot donate if you are intoxicated or feel unwell from drinking, and it is best to avoid alcohol before and for about 24 hours after you give.
Alcohol does not make you permanently ineligible. But drinking right before you donate can cause problems on the day.
Why alcohol matters
- Dehydration: alcohol is a diuretic and makes the draw harder
- Blood pressure: it widens blood vessels and can make you dizzy during or after giving
- Safety: a donor who is intoxicated, or who feels unwell from drinking, cannot donate that day
Before donating
US blood centers do not usually set a fixed number of hours, but they ask that you not be under the influence. Sensible practice: skip alcohol the night before and the day of your donation, and drink extra water.
After donating
Your body is replacing fluid. The American Red Cross recommends avoiding alcohol for 24 hours after donating, because it can make dizziness worse.
Beer and wine count
Any alcoholic drink counts, whatever the strength. If you had a drink last night and feel well, you are usually fine, but be honest with the screener.
The staff decide on the day, and what you tell them is confidential.
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.