Drug & supplement interaction

Rehmannia + Pilocarpine

Pilocarpine brand names: Salagen, Pilocar, Vuity, Qlosi.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Rehmannia and Pilocarpine in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Rehmannia and Pilocarpine

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Pilocarpine and Rehmannia in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Rehmannia safety at a glance

Rehmannia overall Use caution Generally used in traditional medicine, but human safety data are limited and quality varies between products.
Pregnancy Avoid Not enough safety information; best avoided during pregnancy.
Breastfeeding Avoid Not enough safety information; best avoided while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Pilocarpine and Rehmannia? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Pilocarpine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Pilocarpine is filed under 3 classifications — cholinergic drugs, topical drugs, oral drugs. Rehmannia has documented interactions with 2 drug classes — the most serious being antidiabetes drugs (moderate) and antihypertensive drugs (moderate) — and none of Pilocarpine’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Rehmannia Does Interact With Other Medications

Rehmannia has 258 moderate known drug interactions in our database — Pilocarpine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 258 No known interaction 2,572 (incl. Pilocarpine)
Taking anything else?

Check Another of Your Medications Against Rehmannia

Covers the 2,830 medications we’ve checked against Rehmannia. Pick one to open its full report.

What to actually watch for

What Pilocarpine’s Own FDA Label Lists

This is not an interaction — none of it involves Rehmannia. These are the most notable effects listed in the ADVERSE REACTIONS section of Pilocarpine’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both.

  • Chills
  • A stuffy or runny nose
  • Sweating
  • Nausea mentioned in 6.2% of FDA reports for Pilocarpine
  • Diarrhea

From the ADVERSE REACTIONS section of the FDA label for Pilocarpine. Read the label on DailyMed › Where a percentage is shown, it is the share of 3,286 voluntary FDA FAERS reports for Pilocarpine that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Rehmannia’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Rehmannia side to compare — that is a limit of the record, not a statement that Rehmannia has no side effects.

Everything else you take

See Every Supplement That Interacts With Pilocarpine

This page covers Rehmannia only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Pilocarpine page lists 40 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Bacopa (moderate), Bael (moderate), Betel Nut (moderate) and Boxwood (moderate).

By severity: 1 major · 28 moderate · 11 minor.

From our pharmacist’s overview on the Pilocarpine page

“Pilocarpine stimulates the body's cholinergic system, whether as Salagen tablets for the dry mouth of Sjogren's or radiation treatment or as eye drops like Vuity, and its supplement list calls for real care. The one major-rated interaction among the 40 on file is activated charcoal, which soaks up the drug in the gut and can cut how mu…”

Reviewed by 2 · Jul 18, 2026

Open the Pilocarpine interaction page

One more smart check

Taking Rehmannia as Part of a Dietary Supplement Product? Check It for Interactions

We hold 861 real supplement products containing Rehmannia, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Rehmannia. Even though Rehmannia itself has no known interaction with Pilocarpine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Rehmannia and Pilocarpine Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Rehmannia
Top 25%

#261 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Pilocarpine
Steady interest

#1,749 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Rehmannia reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Rehmannia and Pilocarpine records this page draws on were last updated June 22, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Rehmannia

What is Rehmannia?

  • Kidney and adrenal support
  • Anemia and blood building (traditional)
  • Inflammatory conditions
  • Allergies
  • Fatigue and aging-related complaints

Rehmannia is a root used for centuries in Traditional Chinese Medicine, often to 'tonify' the kidneys and support energy or blood health. Human evidence for most modern uses is limited, so it should be viewed as unproven rather than reliable. Talk with a pharmacist or doctor before trying it, especially if you are pregnant, breastfeeding, or take other medicines.

Rehmannia glutinosa · Orobanchaceae · Root (raw or steam-prepared) · Dried root, decoctions/teas, capsules, tinctures, and ingredient in multi-herb formulas

An interaction check asks whether these two react with each other — it does not ask whether Rehmannia is a good idea for someone in your situation. Here is what our Rehmannia record says about it on its own.

Rehmannia: dosing

There is no official, well-established standardized dose for Rehmannia. Traditional use varies widely depending on the form (raw versus prepared root), whether it is a tea, capsule, or tincture, and whether it is part of a larger herbal formula.The safest approach is to follow the directions on the product label and not exceed them.

From our Rehmannia monograph — the full record covers uses, side effects and every documented interaction.

Read the full Rehmannia monograph & all interactions
Medication

About Pilocarpine

What Is Pilocarpine Used For?

Brand names: Salagen, Pilocar, Vuity, Qlosi

Pilocarpine eye drops are used to lower elevated pressure inside the eye in people with open-angle glaucoma or ocular hypertension, to manage acute angle-closure glaucoma, to prevent pressure spikes after laser eye surgery, and to cause pupil constriction (miosis) when needed. Vuity and Qlosi eye drops, as well as Pilocarpine Hydrochloride Ophthalmic solution, are specifically approved to treat presbyopia (age-related difficulty focusing up close) in adults.

Pilocarpine tablets — including Salagen and generic pilocarpine hydrochloride tablets — are used by mouth to relieve dry mouth caused by salivary gland damage from radiation therapy for head and neck cancer, or from Sjögren's syndrome (an autoimmune condition that reduces saliva and tear production).

See full Pilocarpine drug information
Keep checking

Other Drugs & Rehmannia

Browse every other medication we’ve checked against Rehmannia — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
258Moderate
0Minor
2,571No known interaction
258 Moderate 2,571 No interaction
Moderate

258 interactions

Showing 60 of 258 moderate interactions — see all 258 on the Rehmannia page.

No interaction 2,571 drugs checked — show the list

We also checked Rehmannia against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,571 medications checked with no known interaction — see the full Rehmannia list.

See the full Rehmannia interactions page
See every supplement checked against Pilocarpine, ranked by severity
Evidence & sources

Rehmannia References

The 3 references that drive our Rehmannia monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Zhang R, Zhou J, Jia Z, et al. Hypoglycemic effect of Rehmannia glutinosa oligosaccharide in hyperglycemic and alloxan-induced diabetic rats and its mechanism. J Ethnopharmacol 2004;90:39-43. PubMed
  2. Zhang RX, Li MX, Jia ZP. Rehmannia glutinosa: review of botany, chemistry and pharmacology. J Ethnopharmacol 2008;117(2):199-214. PubMed
  3. Chao CH, Hsu JL, Chen MF, et al. Anti-hypertensive effects of Radix Rehmanniae and its active ingredients. Nat Prod Res. 2020;34(11):1547-1552.

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Rehmannia and Pilocarpine Together: Common Questions

Is it safe to take Rehmannia with Pilocarpine?
We do not list a known interaction between Rehmannia and Pilocarpine. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
How was the Rehmannia and Pilocarpine combination checked?
Interactions in our licensed database are recorded against drug classes. Pilocarpine is filed under 3 classifications, and Rehmannia has documented interactions with 2 drug classes — none of Pilocarpine's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Rehmannia interact with any other medications?
Yes. Rehmannia has 258 documented drug interactions in our database — Pilocarpine is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Pilocarpine interact with any supplements?
Yes. Pilocarpine has documented interactions with 40 supplements in our database — Rehmannia is not one of them. The Pilocarpine interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Rehmannia monograph Uses, safety profile, and every drug interaction in one place Pilocarpine drug information The full plain-English guide to this medication Pilocarpine supplement interactions Every supplement checked against Pilocarpine, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Pilocarpine and Rehmannia?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.