Medication interactions and supplements

Medication interactions and supplements

A medication interaction can happen when one medicine, supplement, food, drink, or substance changes how another medicine works. Some interactions make a medicine stronger, weaker, or more likely to cause side effects. Others can affect lab tests, procedures, or recovery after a hospital visit.

Before starting a new supplement, herbal product, over-the-counter medicine, vitamin, or substance while taking prescription medicine, ask your pharmacist or care team. This is especially important if you recently left Alchemilla, were seen at Brookhaven, had a dose change, are preparing for surgery, or take more than one medication.

[[sh:The tea label is quiet until it meets the pill bottle.]]

Quick summary

Interaction Check Supplements Herbal Products OTC Medicine Alcohol Warning Pharmacist First

What an interaction means

An interaction does not always mean something dangerous will happen. It means the combination needs to be checked. Sometimes the pharmacist or care team will say the combination is fine. Other times, they may recommend timing changes, monitoring, avoiding a product, or using a different medicine.

What to list for your pharmacist or care team

A safe interaction check depends on a complete list. Include products even if they feel “natural,” occasional, old, borrowed, or not important. If it goes in or on your body, the care team may need to know about it.

[[sh:The thing you forgot to name is often the thing the bottle remembers.]]

Who to ask first

The pharmacist is usually the fastest first contact for interaction checks. The care team should review questions that may change your medical plan, require monitoring, or involve symptoms after starting or combining products.

Supplements and herbal products

Supplements, vitamins, minerals, teas, herbal products, and “natural” remedies can still interact with medicines. Tell your pharmacist and care team before starting, stopping, or replacing a prescribed medicine with a supplement.

[[sh:The remedy in the cabinet may have a history. History is not the same as safety.]]

Over-the-counter medicines

Over-the-counter medicine can still interact with prescription medicine or duplicate an ingredient you are already taking. Cold, flu, allergy, pain, sleep, stomach, and cough products often contain more than one active ingredient.

Food, alcohol, and timing

Some medications should be taken with food. Others should be taken on an empty stomach. Some should not be taken with alcohol, grapefruit, certain supplements, or other products. If the label mentions food or alcohol and you are not sure what it means, ask the pharmacist.

Before procedures, surgery, imaging, or lab testing

Tell the ordering team, procedure team, surgeon, anesthesiology team, pharmacist, or lab staff about supplements and over-the-counter medicines before testing or procedures. Some products may affect bleeding, anesthesia, sedation, lab results, contrast instructions, or recovery.

[[sh:Before the elevator opens on Radiology, empty your pockets and name what you have swallowed.]]

After a visit, emergency care, or hospital discharge

Interactions are easier to miss after a visit or discharge because medications may have been started, stopped, changed, replaced, or added temporarily. Compare your discharge medication list with the bottles and supplements you have at home.

For post-visit medication help, review Refill medication after an emergency or hospital visit and Understand medication instructions.

When to call now or get urgent help

Use phone or urgent care instead of portal messaging if the interaction question affects a dose you need to take today, if symptoms are worsening, or if you may have taken too much or combined unsafe products.

Message templates

Use these templates for non-urgent interaction questions. Call if you need guidance before the next dose, symptoms are changing, or you may have taken an unsafe combination.

Subject: Medication interaction question - [medication name]

Hello,

I would like help checking for a possible interaction.

Prescription medication:
[Medication name, strength, dose, and frequency]

Other product:
[Over-the-counter medicine / supplement / vitamin / herbal product / food or drink / alcohol / other]

Other product details:
[Brand, active ingredients, dose, and how often you use it]

Reason I want to use it:
[Reason]

Symptoms:
[Symptoms / no symptoms]

Next prescription dose due:
[Date/time]

Pharmacy:
[Pharmacy name and phone number]

Please let me know whether I should ask the pharmacist, avoid the combination, separate the timing, or schedule a medication review.

Best callback number:
[Phone number]

Subject: Supplement question - [supplement name]

Hello,

I would like to ask whether [supplement or herbal product name] is safe with my current medications.

Supplement or herbal product:
[Product name and brand]

Ingredients:
[Ingredient list or upload/photo if requested]

Dose:
[Amount and how often]

Why I want to take it:
[Reason]

Current prescription medications:
[List medication names, strengths, doses, and schedule]

Over-the-counter medicines:
[List any OTC medicines]

Symptoms or side effects:
[Symptoms / no symptoms]

Please let me know whether I should avoid it, separate the timing, check with the pharmacist, or schedule a medication review.

Best callback number:
[Phone number]

Subject: Over-the-counter medicine question - [product name]

Hello,

I would like to ask whether I can take [over-the-counter product name] with my current medications.

OTC product:
[Product name and brand]

Active ingredients:
[Active ingredients from label]

Dose I plan to take:
[Dose and frequency]

Reason I want to take it:
[Cold / pain / allergy / sleep / stomach symptoms / cough / other]

Prescription medications:
[List medication names, strengths, doses, and schedule]

Supplements or herbal products:
[List any]

Symptoms:
[Symptoms / no symptoms]

Please let me know whether this is safe, whether I should choose a different product, or whether I should call the pharmacist.

Best callback number:
[Phone number]

Subject: Food, alcohol, or timing question - [medication name]

Hello,

I have a question about food, alcohol, or timing with [medication name and strength].

Medication:
[Medication name and strength]

How I take it:
[Dose and frequency]

Question:
[Take with food / empty stomach / separate from vitamins or antacids / alcohol warning / grapefruit / caffeine / other]

Next dose due:
[Date/time]

Other medications or supplements:
[List them]

Symptoms:
[Symptoms / no symptoms]

Please let me know whether I should take this with food, avoid alcohol, separate timing, or ask the pharmacist before the next dose.

Best callback number:
[Phone number]

Subject: Medication and supplement question before procedure - [procedure name]

Hello,

I have an upcoming [procedure / surgery / imaging / lab test] and need to confirm my medications and supplements.

Procedure or test:
[Name]

Date:
[Date]

Prescription medications:
[List medication names, strengths, doses, and schedule]

Over-the-counter medicines:
[List any]

Supplements, vitamins, or herbal products:
[List product names, doses, and how often]

Question:
[Should I stop or hold anything / when should I stop / when can I restart / does this affect anesthesia, bleeding, contrast, or lab results?]

Please let me know what I should continue, pause, avoid, or review with the pharmacist.

Best callback number:
[Phone number]

Subject: Brookhaven medication interaction question - [medication name]

Hello,

I have a Brookhaven-related medication interaction question.

Medication:
[Medication name and strength]

How I take it:
[Dose and frequency]

Other product or substance:
[Prescription / OTC / supplement / herbal product / alcohol / cannabis / other]

Other product details:
[Name, ingredients, dose, and how often]

Reason for question:
[Side effects / mood change / sleep change / anxiety / substance-use concern / procedure prep / other]

Safety concern:
[No / yes - explain if safe to do so]

Next dose due:
[Date/time]

Please let me know whether I should ask the pharmacist, avoid the combination, call Brookhaven, or schedule a medication review.

Best callback number:
[Phone number]

Brookhaven-related interactions and supplements

Brookhaven-related medications may interact with alcohol, substances, sleep aids, supplements, over-the-counter products, and other prescriptions. Interaction questions may also involve mood, sleep, anxiety, cravings, restlessness, sedation, confusion, or safety.

If you use proxy or caregiver access, you may not see every Brookhaven-related medication, message, or interaction warning. Some behavioral health, substance-use, minor/dependent, safety, or sensitive medication information may have additional access limits.

For related access guidance, review Understand Brookhaven test result privacy.

[[sh:Brookhaven keeps a list of what you brought with you. The list is shorter when you hide from it.]]

Medication safety reminders

Interaction questions can become safety concerns when symptoms appear, products are mixed by mistake, or a supplement is used in place of prescribed treatment.

Related articles

FAQ