# Pre-exposure prophylaxis (PrEP) — Blood donor deferral criteria compared across national blood services

For Pre-exposure prophylaxis (PrEP), blood service is Canadian Blood Services; waiting period is 4 months; condition is after stopping oral PrEP; 2 years after stopping injectable PrEP; outcome is temporary deferral, recorded from its source on 2026-08-06.

- **Criterion:** Pre-exposure prophylaxis (PrEP) _(verified: appears in the quote below)_
- **Blood service:** Canadian Blood Services _(our reading, not quoted from the source)_
- **Waiting period:** 4 months
- **Condition:** after stopping oral PrEP; 2 years after stopping injectable PrEP _(verified: appears in the quote below)_
- **Outcome:** temporary deferral _(our reading, not quoted from the source)_

## What the source says

> If you are taking pre-exposure prophylaxis (PrEP) medication to prevent an HIV infection, you are not able to donate. If you stop taking PrEP you must wait four months if you were taking oral PrEP before you can donate and must wait two years if you were taking injectable PrEP before you can donate.

## Source

- https://www.blood.ca/en/blood/am-i-eligible-donate-blood/eligibility/medications-vaccinations

Last verified: 2026-08-06. Review by: 2027-02-02.
Part of [Blood donor deferral criteria compared across national blood services](https://referencesource.org/blood-donor-deferral-criteria/).