By Medically reviewed by Panel Perubatan Hello Doktor


What is rehmannia used for?

Rehmannia is a plant. The root and parts that grow above the ground are used to make medicine.

Rehmannia is used for:

How does it work?

There are not enough studies about how rehmannia works. Please discuss with your herbalist or doctor for more information. However, it is known that some chemicals in rehmannia seem to affect the immune system and might reduce pain and swelling. Some chemicals in rehmannia also seem to lower blood sugar levels.

Precautions & warnings

What should I know before using rehmannia?

Consult with your doctor or pharmacist or herbalist, if:

  • You are pregnant or breastfeeding. This is because, while you are expecting or feeding a baby, you should only take medicines on the recommendation of a doctor.
  • You are taking any other medicines. This includes any medicines you are taking which are available to buy without a prescription.
  • You have allergy with any substances of rehmannia or other medications or other herbs.
  • You have any other illnesses, disorders, or medical conditions.
  • You have any other types of allergies, such as to foods, dyes, preservatives, or animals.

The regulations for a herb are less strict than the regulations for a drug. More studies are needed to determine its safety. The benefits of taking this herb must outweigh the risks before use. Consult with your herbalist or doctor for more information.

How safe is rehmannia?

There is not enough information available to know if rehmannia is safe to take for medical conditions.

Special precautions & warnings:

Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking rehmannia if you are pregnant or breast-feeding. Stay on the safe side and avoid use.

Diabetes: Since rehmannia might affect blood sugar levels, people with diabetes should avoid or be very cautious about taking rehmannia. If you have diabetes and take rehmannia, monitor your blood sugar carefully.

Surgery: Because rehmannia might affect bloodglucose levels, it might interfere with blood sugar control during and after surgery. Stop using rehmannia at least 2 weeks before a scheduled surgery.

Side effects

What kind of side effects may I have from rehmannia?

This herb may cause loose bowel movements in some people and may cause bloating. In some rare instances nausea and abdominal pain may be experienced when using this herb.

Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about side effects, please consult your herbalist or doctor.


What interactions may I have with rehmannia?

Rehmannia may interact with your current medications or medical conditions. Consult with your herbalist or doctor before using.

Products that may interact with rehmannia include:

  • Antidiabetes drugs

Rehmannia might decrease blood sugar. There is concern that taking rehmannia with other medications for diabetes might cause blood sugar to decrease too much. Monitor your blood sugar closely. The dose of your diabetes medication might need to be changed.

Some medications used for diabetes include glimepiride (Amaryl), glyburide (DiaBeta, Glynase PresTabs, Micronase), insulin, pioglitazone (Actos), rosiglitazone (Avandia), chlorpropamide (Diabinese), glipizide (Glucotrol), tolbutamide (Orinase), and others.


The information provided is not a substitute for medical advice. ALWAYS consult your herbalist or doctor before using this medication.

What is the usual dose for rehmannia?

The dose for rehmannia may be different for every patient. The dose that you take depends on your age, health, and several other conditions. Herb are not always safe. Please discuss with your herbalist or doctor for your appropriate dosage.

What form does rehmannia come in?

Rehmannia may be available in the following dosage forms:

  • Rehmannia vitalizercapsules
  • Rehmannia complex capsules
  • Rehmannia liquid extract

Hello Health Group does not provide medical advice, diagnosis or treatment.

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Review Date: August 3, 2017 | Last Modified: December 4, 2019

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