Over-the-counter medicines, supplements and interactions

Your repeat prescription is only part of the picture

A medicines list can look complete while missing the products kept in a kitchen cupboard or bought online. An occasional cold remedy, indigestion treatment, vitamin or herbal product may not appear on your GP repeat prescription. Include it when asking a pharmacist to consider everything you take together.

Think through an ordinary week and the less ordinary days too: what you use for a headache, a poor night’s sleep or a symptom that comes and goes. Say whether you currently take the product, used it recently or are only considering buying it. That distinction helps the reviewer understand the question.

Record the ingredients and how you use the product

NHS Specialist Pharmacy Service advises checking the exact product, strength, formulation and ingredients when considering complementary products. Products with similar names may contain different ingredients. Keep the label or packaging so the pharmacist does not have to infer what is inside.

A note saying ‘one supplement daily’ leaves important gaps. A clearer note names the product, records the ingredients and amount shown on the label, and explains how much you actually use. Do not translate an unfamiliar ingredient into a medicine name yourself; copy it accurately and ask if it is unclear.

• Product name and manufacturer, as printed on the packaging.
• Ingredients, strength and whether it is a tablet, liquid, powder or another form.
• Amount used, frequency and whether use is occasional or regular.
• When you started, why you use it and any changes you have noticed.
• Where you bought it, and any advice a clinician has already given.

Natural does not establish safety alongside medicines

The NHS warns that herbal medicines can interact with prescribed and shop-bought medicines. It recommends checking with a pharmacist before taking a herbal medicine if you already take other treatment. Mention relevant health conditions as well as your medicines when asking for advice.

This is not a reason to assume that every supplement causes a problem. It is a reason to check the particular product in the context of your care. If an advert says a product is natural, that description does not answer whether it is suitable alongside your prescription. Do not replace prescribed treatment with a complementary product on the strength of an advert or testimonial.

An interaction search cannot answer every question

Specialist Pharmacy Service notes that evidence about complementary-product interactions can be limited. A missing warning in an online search therefore cannot establish that a combination is safe. Conversely, a warning may need interpretation in light of the exact ingredients, your other treatment and your health.

Bring the question to a pharmacist with the label and your complete list. Ask whether there is enough information to assess the product, whether any ingredients overlap with other products and what follow-up is appropriate. If the answer is uncertain, ask what further information would help rather than treating uncertainty as reassurance.

Use your review to agree what happens next

Keep one current list that includes prescribed, occasional and shop-bought products. After a conversation, record the advice, who gave it and any follow-up agreed. If you help another adult with their medicines, check the list with them and use their permission or other lawful authority when sharing it.

MedReview can consider the information you provide as part of a private pharmacist-led review. It does not test a supplement’s contents, guarantee that every interaction will be found or change your prescription. You can also ask your community pharmacist about a product before buying it. If you feel unwell or have an urgent concern, seek clinical help promptly rather than waiting for a routine report.