The short answer
Supplements and over-the-counter products are not regulated the same way as prescription medicines. Some can interact with prescriptions, and evidence for many claims is limited or mixed. Keeping one up-to-date list — including doses and how often you take each item — helps your care team review everything together.1
Why one complete list
Information about medicines is often scattered: prescriptions at the pharmacy, vitamins at home, occasional pain relievers in a drawer, and something a friend recommended last month. When these are reviewed separately, interactions and duplications are easier to miss.
A single list — updated as things change and brought to appointments — gives your care team a complete picture. It also reduces the risk of two clinicians prescribing overlapping medicines without realizing it.
Supplements: different rules
In many countries, including the United States, dietary supplements are regulated as a category of food rather than as medicines. This has several implications:
| Aspect | Prescription medicines | Dietary supplements |
|---|---|---|
| Pre-market approval | Required for safety and efficacy | Generally not required |
| Label claims | Must be supported by evidence | Restricted, but enforcement varies |
| Interaction screening | Routine in clinical settings | Depends on the product and the user reporting it |
| Quality control | Regulated manufacturing standards | Variable; some products have been found to differ from labels |
This does not mean all supplements are ineffective or unsafe — it means the evidence base and quality controls are different, and caution is reasonable.2
Interactions and evidence
Some supplements can interact with prescription medicines. Examples that are commonly discussed in clinical literature include:
- St. John's wort, which can affect how the body processes several medicines.
- High-dose vitamin K, which can interfere with certain blood thinners.
- Ginkgo and garlic supplements, which may affect bleeding risk.
- Some herbal products, which may affect liver enzymes involved in drug metabolism.
Evidence for many supplement claims in lung health is limited. Some studies are small, some are observational, and some show no meaningful difference. Where evidence is limited, it is reasonable to say so rather than presenting a claim as established.
Building the list
A simple approach:
- Write down every prescription medicine, including dose and frequency.
- Add every supplement, vitamin, and herbal product — including occasional ones.
- Include over-the-counter items used regularly (pain relievers, antacids, sleep aids).
- Note any products you have stopped or started recently.
- Keep the list in one place — paper, phone note, or both.
- Bring it to appointments, or share it in advance if your clinic offers that.
For related reading, see our guide Understanding a Respiratory Care Plan and our article on Rescue and Maintenance Inhalers.
What to discuss with your care team
- I have a supplement I am considering — is it safe with my prescriptions?
- Are there interactions I should be aware of with what I already take?
- Should I pause any supplements before a procedure or appointment?
- Is there evidence supporting this product for my situation?
- Would you like me to bring my full list to the next visit?
Sources
- U.S. Food and Drug Administration. Dietary Supplements: What You Need to Know.
- National Center for Complementary and Integrative Health. Dietary Supplements: What You Need to Know.
- National Heart, Lung, and Blood Institute. COPD: Treatment and Management.
- Centers for Disease Control and Prevention. Medication Safety Basics.