Your injector said “avoid blood thinners” and then moved on to the consent form. You are now the night before your appointment, searching your medicine cabinet trying to work out if any of this counts.
Most pre-lip filler instructions are delivered as a vague category. Here is the actual list, why each item matters for lip filler specifically, and a clear hierarchy so you know what is genuinely important versus what is minimal-impact.
Blood Thinners and Bruising Risk
This is the highest-impact category for lip filler, and the one where the timing actually matters most.
Aspirin, ibuprofen, and naproxen inhibit platelet aggregation, which is the process your body uses to form clots and stop bleeding at injection sites. When these are on board, bruising is more severe and longer-lasting. The effect is meaningful and consistent. Stop these three to seven days before your appointment where possible.
Paracetamol (acetaminophen) does not have the same platelet effect and is safe to use for pain management in this window. If you have a headache the day before, paracetamol is fine. Ibuprofen is not.
One important note: prescription anticoagulants including warfarin, rivaroxaban, apixaban, and others must never be stopped without consulting the doctor who prescribed them. Tell your injector you are on them. They may proceed with adjusted technique and expectations, or they may reschedule. Do not make that decision unilaterally. The bruising outcome of lip filler bruising on anticoagulants is significantly different from standard bruising, and the clinical decision belongs to the professionals involved.
Supplements That Increase Bleeding
These are the items most injectors do not specifically mention and patients do not think to disclose. Fish oil, vitamin E at high doses, garlic supplements, ginkgo biloba, and St. John’s Wort all have platelet-inhibiting or vasodilating properties. Stop these seven to ten days before where possible.
Patients who bruise badly and cannot explain why are almost always on fish oil, ibuprofen, or both without realising either counts. Fish oil is particularly overlooked because it is sold as a health supplement rather than a medication. A standard dose of 1,000 to 2,000mg daily has a real effect on bleeding time.
Low to medium doses of vitamin C are fine and do not need to be stopped. High-dose vitamin E is the issue, not standard multivitamin levels. If you take a targeted antioxidant supplement with multiple grams of vitamin E daily, stop that. A standard multivitamin is not a concern.
Alcohol
Stop 24 to 48 hours before minimum. Alcohol is a vasodilator, meaning it widens blood vessels, and this increases both the bruising response and the inflammatory swelling that follows injection. It also temporarily impairs clotting.
The honest version: a single glass of wine the night before is unlikely to cause a significant problem. It will not ruin your result. A big night out two days before is a real risk for worse bruising and more pronounced initial swelling. The “avoid alcohol for 48 hours” instruction is a reasonable middle ground that accounts for the range of drinking and the range of individual responses. You are an adult and can assess your own situation, but if you have a social event that will involve drinking, place it after the appointment rather than before it.
Dental Work: The One Most Clinics Forget to Mention
This is the item that consistently surprises patients, and consistently gets omitted from standard pre-treatment instructions. Stop dental work two weeks before filler and two weeks after.
Dental procedures, including cleaning, fillings, extractions, and orthodontic adjustments, introduce oral bacteria into the bloodstream. This is normal and harmless in the context of a routine immune system. In the context of hyaluronic acid filler sitting in the lip tissue, those bacteria can seed the filler deposit and trigger infection or biofilm formation. Biofilm in filler is difficult to treat and can persist for months.
This is not a theoretical risk. It is well-documented enough that every responsible practice includes it in pre-treatment instructions. Many do not, either from oversight or because it is inconvenient for scheduling. Take it seriously regardless of whether your clinic mentioned it.
Cold Sore History
If you have any history of oral herpes, cold sores, or fever blisters, disclose this to your injector before treatment. This is not optional disclosure.
Needle trauma near the lip area can trigger reactivation of the herpes simplex virus in patients who carry it. Even people who have not had a cold sore in years can experience a reactivation triggered by the trauma and inflammation of lip filler. Prophylactic antiviral medication, typically valacyclovir, taken before the appointment can prevent this effectively. Your injector or GP can prescribe it.
Failing to disclose a history of cold sores and developing a reactivation after filler is miserable and avoidable. Disclosing it and taking a preventive antiviral is straightforward. Say it at the consultation.
Retinoids: Not the Main Concern for Injections
Retinoids and retinol creams are often on general pre-treatment instruction lists, and patients end up wondering whether they need to stop their entire skincare routine. For lip filler specifically, retinoids are not a primary concern. They matter for procedures that break the skin barrier, such as laser, microneedling, or chemical peels. Injections enter the skin with a needle rather than abrading the surface, so the barrier disruption concern is different in character.
You do not need to stop your retinol for lip filler. Some injectors recommend it as a general precaution, and it is harmless to comply if you want to err on the side of caution. But it is not in the same category as dental work or cold sore history. For a full understanding of when to stop and restart retinoids around cosmetic procedures, the retinol restart guide covers the context by procedure type.
The Honest Hierarchy
The “avoid everything for two weeks” instruction that some clinics give is overcautious for most of these items, and it tends to get ignored because it is unrealistic. The real hierarchy is this.
At the top: dental work and cold sore history. These are genuinely important, frequently omitted, and carry real consequences. The dental work window is two weeks before and after. Cold sore history requires antiviral prophylaxis every time, not just the first time.
In the middle: blood thinners and alcohol. These have meaningful impact on bruising severity and recovery. Stopping NSAIDs three to seven days before and alcohol 48 hours before is the practical standard. Worth doing. Not catastrophic if imperfectly observed.
At the bottom: supplements. Worth stopping seven to ten days before if you remember, but the impact is lower. Fish oil and high-dose vitamin E are the most relevant. A missed day of supplements is not a reason to reschedule.
The full picture of what to expect in the days after your appointment, including bruising and swelling timelines, is in the 7-day lip filler recovery timeline. Knowing what is normal versus what warrants a call will save you more anxiety than any supplement schedule.
FAQ
Is it okay to take paracetamol before lip filler?
Yes. Paracetamol (acetaminophen) does not affect platelet function the way ibuprofen and aspirin do. If you need pain relief in the days before your appointment, paracetamol is the right choice. Ibuprofen and aspirin inhibit platelet aggregation and increase bruising, so those are the ones to avoid in the three to seven days before treatment.
I had a dental cleaning last week. Should I reschedule my filler?
Ideally yes, if you can. The two-week gap before filler exists because dental procedures introduce oral bacteria into the bloodstream, and those bacteria can seed filler deposits. If rescheduling is not possible, discuss it with your injector. Some providers will proceed and monitor closely; others will want to reschedule. The risk is real and worth taking seriously rather than ignoring.
Does vitamin C affect lip filler bruising?
Standard vitamin C at typical supplemental doses does not have meaningful platelet-inhibiting effects and does not need to be stopped before lip filler. High-dose vitamin E is the supplement more relevant to bleeding time. If you take a standard vitamin C supplement for immune support or skin health, continue it. The supplements to watch are fish oil, high-dose vitamin E, ginkgo biloba, and St. John’s Wort.
This article is for educational purposes only and is not a substitute for professional medical advice. Always follow your injector’s or surgeon’s specific aftercare instructions.