Drug & supplement interaction

Tetrahydrocannabivarin (thcv) + Lamotrigine

Lamotrigine brand name: Lamictal.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Tetrahydrocannabivarin (thcv) and Lamotrigine 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.

Know someone taking this? Share
Facebook Post Reddit Email
On this page
Interaction report

Tetrahydrocannabivarin (thcv) and Lamotrigine

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 Lamotrigine and Tetrahydrocannabivarin (thcv) 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.

Worth understanding: our licensed dataset holds no drug-interaction record for Tetrahydrocannabivarin (thcv) at all — not against Lamotrigine, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

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.

Tetrahydrocannabivarin (thcv) safety at a glance

Tetrahydrocannabiv... overall Use caution Human safety data are limited, and product quality and legality vary a lot.
Pregnancy Avoid Cannabis-derived compounds are not considered safe in pregnancy.
Breastfeeding Avoid Cannabinoids can pass into breast milk, so avoid use while nursing.

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

Still wondering about combining Lamotrigine and Tetrahydrocannabivarin (thcv)? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Lamotrigine’s Own FDA Label Lists

This is not an interaction — none of it involves Tetrahydrocannabivarin (thcv). These are the most notable effects listed in the ADVERSE REACTIONS section of Lamotrigine’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. 6 of them are worth acting on rather than waiting out — marked below.

  • Unsteadiness Worth acting on
  • Seizures Worth acting on
  • Chest pain Worth acting on
  • Low mood Worth acting on
  • A higher chance of infection Worth acting on
  • An allergic reaction Worth acting on
  • Changes to your period
  • Mood changes or irritability
  • Tremor or shakiness
  • A stuffy or runny nose

Showing the 10 most notable of 32 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Lamotrigine. Read the label on DailyMed › Tetrahydrocannabivarin (thcv)’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Tetrahydrocannabivarin (thcv) side to compare — that is a limit of the record, not a statement that Tetrahydrocannabivarin (thcv) has no side effects.

From our Q&A

Questions About Tetrahydrocannabivarin (thcv) or Lamotrigine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Tetrahydrocannabivarin (thcv) or Lamotrigine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Lamotrigine

This page covers Tetrahydrocannabivarin (thcv) only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Lamotrigine page lists 116 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: 1,4-butanediol (major), Activated Charcoal (major), Beer (major), Gamma-hydroxybutyrate (ghb) (major) and Kava (major).

By severity: 7 major · 92 moderate · 17 minor.

From our pharmacist’s overview on the Lamotrigine page

“Alcohol, ordinary beer or wine, sits at the top of the interaction list for lamotrigine (Lamictal), with well-documented added sedation, and it sets the tone for a list I would treat with real care. Of the 116 supplements and herbs on file, 78 have sedative effects of their own, so the biggest theme by far is stacked drowsiness and slo…”

Reviewed by 2 · Jul 18, 2026

Open the Lamotrigine interaction page

How much people look this up

Where Tetrahydrocannabivarin (thcv) and Lamotrigine 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 Tetrahydrocannabivarin (thcv)
Steady interest

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

29 days ago today
Medication Lamotrigine
Top 5%

#50 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. Tetrahydrocannabivarin (thcv) is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Tetrahydrocannabivarin (thcv) reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Tetrahydrocannabivarin (thcv) and Lamotrigine 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 Tetrahydrocannabivarin (thcv)

What is Tetrahydrocannabivarin (thcv)?

  • Appetite control and weight management
  • Blood sugar support
  • Energy and focus
  • General wellness

Tetrahydrocannabivarin (THCV) is a minor cannabinoid found in cannabis that is being studied for appetite, metabolism, and blood sugar, but human evidence is very limited. Product quality, legal status, and dosing vary widely, so talk with your pharmacist or doctor before trying it, and avoid it during pregnancy and breastfeeding.

Cannabis sativa · Cannabaceae · Flowers and leaves of the cannabis plant (THCV is an extracted or isolated cannabinoid) · Oils, tinctures, capsules, gummies, vape products, and isolated extracts

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

Tetrahydrocannabivarin (thcv): dosing

There is no established standard dose for THCV. Research is too limited to recommend a specific milligram amount, and effects may even differ between low and high doses.If you choose to try a product, follow the directions on the label and start with the lowest amount.

From our Tetrahydrocannabivarin (thcv) monograph — the full record covers uses, side effects and every documented interaction.

Read the full Tetrahydrocannabivarin (thcv) monograph & all interactions
Medication

About Lamotrigine

What Is Lamotrigine Used For?

Brand name: Lamictal

Lamotrigine is used to treat several types of seizures in adults and children aged 2 and older — including partial-onset seizures, generalized tonic-clonic (grand mal) seizures, and seizures related to Lennox-Gastaut syndrome. In older teens and adults, it can also be used alone (monotherapy) after transitioning off another seizure medicine.

For adults with bipolar I disorder, lamotrigine is used as a maintenance treatment — meaning it helps delay the return of mood episodes like depression, mania, or mixed states. It is not approved to treat an active manic or mixed episode that's happening right now.

See full Lamotrigine drug information
Keep checking

Other Drugs & Tetrahydrocannabivarin (thcv)

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

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Tetrahydrocannabivarin (thcv) list.

See the full Tetrahydrocannabivarin (thcv) interactions page
See every supplement checked against Lamotrigine, ranked by severity
Evidence & sources

Tetrahydrocannabivarin (thcv) References

The 2 sources that drive our Tetrahydrocannabivarin (thcv) monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Tetrahydrocannabivarin (thcv) is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Cannabis (Marijuana) and Cannabinoids: What You Need To Know — NIH NCCIH Source
  2. Marijuana — MedlinePlus Source

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 Tetrahydrocannabivarin (thcv) and Lamotrigine Together: Common Questions

Is it safe to take Tetrahydrocannabivarin (thcv) with Lamotrigine?
We do not list a known interaction between Tetrahydrocannabivarin (thcv) and Lamotrigine. 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.
Does Lamotrigine interact with any supplements?
Yes. Lamotrigine has documented interactions with 116 supplements in our database — Tetrahydrocannabivarin (thcv) is not one of them. The Lamotrigine 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

Tetrahydrocannabivarin (thcv) monograph Uses, safety profile, and every drug interaction in one place Lamotrigine drug information The full plain-English guide to this medication Lamotrigine supplement interactions Every supplement checked against Lamotrigine, 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 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Lamotrigine and Tetrahydrocannabivarin (thcv)?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.