Homoeopathic medicines: safety, quality and reading labels, a review

Many people assume homoeopathic medicines cannot cause harm because they are so dilute. Official health agencies give a more careful message. This review explains what the US National Center for Complementary and Integrative Health (NCCIH), the US Food and Drug Administration (FDA) and the Ministry of Ayush say about safety, quality and labels. It does not recommend any product.

1. Introduction

Homoeopathic remedies are made from plants, minerals and animal sources, and many are diluted so far that no molecules of the original substance may remain ^[1]. Because of this, some people expect them to be risk free. NCCIH points out, however, that not all products labelled homeopathic are highly diluted, and that some contain enough of the active ingredient to cause side effects or interact with other medicines ^[1].

Safety also depends on the person. Children, older people, pregnant women and people with long-term illnesses can react differently from healthy adults, and a product that seems harmless for one person may not suit another. This is why a short conversation with a doctor or pharmacist before use is a sensible habit.

2. Known safety concerns

NCCIH reports the following points ^[1]:

• A 2012 review of case reports found adverse effects, some of them serious. NCCIH links these to certain products, such as those containing heavy metals like mercury or iron that are not highly diluted, and to cases where an ineffective homeopathic product replaced an effective conventional treatment.
• Liquid products can contain alcohol, and in the United States higher alcohol levels are allowed in them than in conventional drugs.
• Some practitioners describe a temporary worsening of symptoms called "homeopathic aggravation", but clinical studies have found little evidence of it and research is limited.

The FDA adds that some of these products have been found to contain measurable amounts of active ingredients, which matters because they are sometimes made from known poisons or toxins ^[2]. It also notes that poor manufacturing can lead to contamination and wrong dilutions, and that since 2020 it has issued more than 20 warning letters to companies, including for serious quality violations such as sterility concerns and contamination ^[2].

3. Quality and standards

In India, the Pharmacopoeia Commission for Indian Medicine and Homoeopathy develops quality standards for homoeopathic drugs, and the Ministry of Ayush reports that monographs for 1,117 homoeopathic drugs have been published. The Ministry's Drug Policy Section also administers the Drugs and Cosmetics Act, 1940 for Ayurveda, Siddha, Unani and homoeopathy drugs ^[5]. The Ministry reported 362 homoeopathy drug manufacturing units as on 1 April 2024 ^[5]. Standards are useful, but patients still need to buy from licensed sources and check the label.

4. How to read a homoeopathic label

The FDA advises looking for the word "homeopathic" on the label. Ingredients are often given by Latin or scientific names with a dilution mark such as 1X, 6X or 2C ^[2]. Such products are sometimes placed on shelves close to ordinary non-prescription medicines, which can make them hard to tell apart ^[2]. Check for:

• the manufacturer, batch number and expiry date
• the list of ingredients and the form (pellets, drops, gel or tablets)
• any alcohol content in liquids
• claims that sound too good to be true, which are a reason to ask your doctor or pharmacist before buying

5. Groups who need extra care

The FDA says it gives priority to unapproved homeopathic products that are meant for infants, children, the elderly, pregnant women or people with weak immune systems, that are injected or used in the eye, or that claim to treat serious or life-threatening diseases ^[3]. The agency explains that such products may lead patients to delay effective treatment ^[3].

Examples from the FDA and NCCIH include:

• Teething: the FDA says that topical gum products containing benzocaine or lidocaine, including creams, gels and homeopathic teething tablets, offer little to no benefit and carry serious risks. It suggests safer ways to ease teething, such as gently rubbing the gums with a clean finger or offering a firm rubber teether that is not liquid-filled ^[4]. NCCIH also notes that a 2017 FDA warning concerned teething tablets with too much belladonna ^[1].
• Asthma: the FDA has warned people not to rely on over-the-counter asthma products labelled homeopathic, as they have not been evaluated for safety or effectiveness ^[1].
• Vaccines: NCCIH says homeopathic "immunisations" are not supported as a substitute for vaccines ^[1].

6. Practical steps

• Ask your doctor or pharmacist which products are safe and effective for you, especially in pregnancy, breastfeeding, old age or childhood ^{[1, 2]}.
• Bring every product to medical appointments, so interactions can be checked ^[1].
• Store all medicines out of the reach of children.
• Report any unexpected reaction to your doctor promptly.

7. When to see a doctor

See a doctor promptly if you or your child has a reaction after taking any product, such as a rash, swelling, vomiting, drowsiness or breathing difficulty. Also see a doctor for symptoms that are severe, new or not improving. Do not wait to see whether a remedy works.

In an emergency, call your local emergency number (112 in India, 911 in the United States).

8. Conclusion

Homoeopathic medicines are not automatically risk free. Official sources describe cases of harm from products that were not highly diluted, contamination and wrong dilution, and delays in effective care. India sets pharmacopoeial standards for these medicines, but patients still need to read labels, buy from licensed sources and talk to their doctor first.