How long should you wait between Advil (ibuprofen) and aspirin?
There isn’t one universal waiting time, because it depends on which aspirin you mean and what you’re trying to treat. In practice, many people space doses to reduce side effects (especially stomach irritation), but the interaction risk is the main issue—not the need for a long “washout” between them.
Key point: taking ibuprofen (Advil) and aspirin close together can affect aspirin’s blood-thinning effect (when aspirin is being used for heart/stroke prevention). That’s why timing can matter.
If aspirin is for blood-thinning (low-dose aspirin): what timing is safest?
If you’re taking low-dose aspirin (often 81 mg) for cardioprotection, a common approach is to avoid taking ibuprofen immediately before or after aspirin, so ibuprofen doesn’t block aspirin’s intended effect.
A commonly used timing strategy is:
- Take aspirin and then wait about 8 hours before ibuprofen, or
- Take ibuprofen and then wait about 2 hours before aspirin.
This helps reduce the chance that ibuprofen interferes with aspirin’s effect.
If aspirin is for pain/fever (not for blood thinning)
When aspirin is being used for pain or fever rather than as a daily antiplatelet, there’s usually less need to worry about “blocking” aspirin’s protective blood-thinning effect. The bigger concern becomes duplicate NSAID effects and stomach irritation when combining these medicines closely.
In that case, spacing doses can still help with side effects, but you generally should not stack them repeatedly unless a clinician has told you to.
What’s the main risk when you take them close together?
The biggest concerns are:
- Higher risk of stomach irritation/ulcers/bleeding when combining aspirin and ibuprofen (both can irritate the GI tract).
- Potential reduction of aspirin’s antiplatelet effect when they’re taken too close together in the low-dose, heart/stroke prevention setting.
When should you avoid combining them without medical advice?
Avoid or get medical advice first if you have:
- A history of stomach ulcers or GI bleeding
- Kidney disease
- You take other blood thinners (like warfarin) or have bleeding disorders
- You’re on daily low-dose aspirin for heart disease/stroke and need ibuprofen frequently
If you tell me the doses, I can suggest a more exact schedule
Reply with:
1) Your aspirin dose (81 mg or 325 mg, or “for pain”)
2) Your Advil dose (200 mg tabs? 400 mg?)
3) What time you took each last dose
4) Why you’re taking them (heart prevention vs pain/fever)
…and I’ll map out a timing plan that matches that use case.