Tell your provider about every medication and supplement you take; several drug classes can interact with antiparasitics.
Antiparasitic medications can interact with certain other prescription drugs, over-the-counter products, and supplements. The safest approach is straightforward: share a complete list of everything you take with your prescribing provider before starting treatment, so they can check for interactions and adjust your plan if needed.
## Why Full Disclosure Matters
Drug interactions happen when one substance changes how another is absorbed, broken down, or cleared from the body, which can increase side effects or reduce effectiveness. Providers can only screen for these problems if they know everything you're taking, including things that are easy to forget to mention, such as vitamins, herbal products, or occasional over-the-counter medications.
## What to Share With Your Provider
- All current prescription medications, including the dose and how long you've taken them - Over-the-counter drugs you take regularly, such as pain relievers or antacids - Vitamins, minerals, and dietary supplements - Herbal or botanical products - Any recent changes to your medication regimen
## Interaction Considerations by Medication
| Medication | What your provider checks | |---|---| | Ivermectin | Other medications processed by the same liver enzyme pathways, and any that increase bleeding risk | | Mebendazole | Medications that affect how it's absorbed or broken down in the liver |
This table reflects general categories your provider evaluates — it is not a complete interaction list, and individual risk depends on your specific medications and health status.
## Supplements and Herbal Products
Some herbal supplements can affect liver enzymes that also process prescription medications. If you take any herbal product regularly, mention it during your intake so your provider can factor it into their review. This is part of why platforms like [Get It Prescribed](/eligibility-and-provider-review) ask detailed questions about your current supplement use during provider review.
## If You Start a New Medication Mid-Treatment
If you're prescribed a new medication by a different provider while completing a course of an antiparasitic such as [ivermectin](/medications/ivermectin) or [mebendazole](/medications/mebendazole), let both providers know about the other prescription. This is especially relevant if the new medication is for a chronic condition and will be taken long-term.
## Using a Pharmacist as an Additional Resource
Pharmacists are trained in medication interactions and are a valuable resource if you have a specific question about combining products. Many pharmacies offer a private consultation, and this is a good option if you want a second check beyond your prescribing provider. You can read more about how prescribing decisions are made on our [how it works](/how-it-works) page.
## Timing Considerations
Some interactions depend on timing rather than just the combination of substances involved. Taking two medications several hours apart, rather than at the same time, can sometimes reduce an interaction risk your provider has flagged. Never adjust timing on your own, however — ask your provider or pharmacist for specific guidance if this applies to your prescribed medication.
## Related questions
### Can I take my regular vitamins while on an antiparasitic medication? In most cases, yes, but you should mention any vitamins or supplements to your provider before starting treatment. Some products can affect how medications are processed by the body, so a quick review helps rule out anything relevant to your situation.
### Does grapefruit juice interact with antiparasitic medications? Grapefruit can affect how some medications are processed in the liver. Ask your provider whether this applies to your prescribed medication, since guidance can vary based on the specific drug and dose.
### What if I forget to mention a medication during intake? Contact your provider as soon as you remember. It's better to disclose a missed medication late than not at all, and your provider can quickly assess whether it changes their recommendation.
### Should I stop other medications before starting treatment? Never stop a prescribed medication without talking to the provider who prescribed it. Your antiparasitic provider will tell you if any temporary adjustment is needed based on the full picture of your medications.
## Sources - [DailyMed — Ivermectin label search](https://dailymed.nlm.nih.gov/dailymed/search.cfm?query=ivermectin&searchtype=BasicSearch) — FDA-approved labeling, including interaction information. - [DailyMed — Mebendazole label search](https://dailymed.nlm.nih.gov/dailymed/search.cfm?query=mebendazole) — FDA-approved labeling, including interaction information. - [MedlinePlus](https://medlineplus.gov/) — General consumer guidance on checking medication interactions.