Siddha medicine safety: quality checks, heavy metals and warning signs

A medicine being traditional or made from natural materials does not by itself make it safe. This article looks at the safety side of Siddha medicine: the risk of metals such as lead, mercury and arsenic in some traditional products, how India licenses and tests these medicines, the warning signs of harm, and the questions worth asking before you buy or use a product.

1. Introduction

The Ministry of Ayush says Siddha medicines come from three groups of materials: plants, inorganic and organic substances including metals and minerals, and animal products ^[1]. Preparations that contain metals could carry a risk of metal poisoning if they are not made and tested properly, so quality control is central to safe use.

2. The heavy metal warning

Heavy metals such as lead, mercury and arsenic can poison the body when taken in toxic amounts. The US National Center for Complementary and Integrative Health (NCCIH) states that some Ayurvedic preparations may contain lead, mercury or arsenic in amounts that can be toxic ^[2]. The US Food and Drug Administration (FDA) warns that certain unapproved Ayurvedic products with high metal levels may cause heavy metal poisoning ^[3].

These warnings come from United States health bodies and are written about Ayurvedic products, not about Siddha medicines as such. Because the Ministry also lists metals and minerals as materials for Siddha medicines ^[1], the same care is sensible. This is a cautious reading, not a finding about any named Siddha product.

3. Warning signs of possible metal poisoning

The FDA lists these effects of heavy metal poisoning ^[3]:

• High blood pressure and kidney injury.
• Tiredness.
• Stomach problems: belly pain, constipation, diarrhoea, nausea and vomiting.
• Nerve effects: tingling or burning in fingers or toes, weakness in the limbs, dizziness, restlessness and confusion.

These signs are not specific. Many illnesses cause them. The way to find the cause is to see a doctor, who can order tests. If you suspect a medicine, ask a doctor whether you should stop it, and take it with you to the visit. In the United States the FDA advises contacting a health care provider or a poison centre; in India, go to a doctor or hospital ^[3].

4. How India licenses and checks Siddha medicines

According to the Ministry ^{[1, 4]}:

• Law. The Drugs and Cosmetics Act, 1940 and its rules apply to Ayurvedic, Siddha and Unani drugs. The Ministry's Drug Policy Section administers the Act for these drugs and coordinates with State Licensing Authorities. The Drugs and Magic Remedies (Objectionable Advertisements) Act, 1954 also applies to these drugs ^[1].
• Licences. A manufacturer needs a licence granted by the state licensing authority, and the rules ask for proof of safety and effectiveness ^[4].
• Good manufacturing practice. Makers must follow good manufacturing practice and meet the quality standards in the official pharmacopoeia ^[4].
• Official standards. PCIM&H sets pharmacopoeial standards, checks samples of drugs available in the market for identity, purity and strength, and serves as the central drug testing cum appellate laboratory. It is accredited under ISO/IEC 17025:2017 by the National Accreditation Board for Testing and Calibration Laboratories ^[1].
• Siddha figures. The Ministry lists 298 Siddha manufacturing units, a Siddha Formulary with 400 formulations, and standards for 139 single drugs ^[1].

The documents used here do not state specific limits for each metal in Siddha medicines, and a licence or standard does not guarantee that every product on a shelf is safe. WHO also lists good manufacturing practices for herbal medicines as an international reference ^[5].

5. What you can do

• Use medicines made by a licensed manufacturer and prescribed by a registered practitioner.
• Avoid products sold without a clear label, without the manufacturer's name or with claims that they work for many unrelated diseases. The Ministry administers a law on objectionable advertisements for these drugs ^[1].
• Be careful about products bought online or from sellers who cannot show their licence.
• Do not exceed the quantity or time advised by your practitioner.
• Ask your doctor for advice if you are pregnant, breastfeeding, have kidney or liver disease, or take other medicines.
• Report a suspected bad reaction to your doctor and to the practitioner, and keep the product so that it can be checked.

6. Special care for some groups

NCCIH advises talking to your health care provider before using Ayurvedic products if you have a health condition, and consulting one if you are pregnant or nursing ^[2]. The same advice is sensible for Siddha medicines.

7. A word on claims and labels

Be wary of any product that promises quick or complete results, or that is said to work for many unrelated problems. A truthful label gives the maker's name, the ingredients and the batch details. If a product is sold online or by post, ask for the maker's name and licence details before you use it. When in doubt, take the product to your doctor or pharmacist before using it, and report any suspected problem to the practitioner and to your doctor.

8. When to see a doctor

See a doctor promptly if you have any of the warning signs above after starting a medicine, if symptoms keep returning, or if you are not sure whether a product is safe. Take the packet, the label and a list of everything you take. Also see a doctor first if you are thinking of stopping a prescribed medicine.

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

9. Conclusion

Siddha medicines include metal and mineral preparations, and warnings from NCCIH and the FDA about heavy metals in some Ayurvedic products justify care. India has licensing, good manufacturing practice and pharmacopoeial standards, but the official pages used here do not guarantee every product. Choose licensed products, use a registered practitioner, watch for warning signs and keep your doctor informed.