Herb & supplement monograph

Ketogenic Diet Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Ketogenic Diet interacts with medications. The heart of this page is the interaction list — every drug Ketogenic Diet is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Ketogenic Diet is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Ketogenic Diet Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Ketogenic Diet drug interaction appears low for most people, though a few medicine groups deserve genuine attention. None of the listed interactions are rated major, and nearly all rest on theoretical reasoning or limited human evidence rather than well-documented harm.

Interactions deserving the most attention

The clearest concerns involve blood sugar and ketones. Pairing keto with SGLT2 inhibitors, a class of diabetes drugs, can raise the risk of ketoacidosis, and expert groups advise against this combination on very low-carb diets. Other diabetes medications may drop blood sugar too far, since the diet itself lowers glucose. The diet may also modestly lower levels of some anticonvulsants, and it can add to kidney stone risk with carbonic anhydrase inhibitors.

What the rest of the list means

The long list of interacting medications largely reflects these broad drug classes, and many entries describe what could happen rather than what has been shown in people. For example, early worries that keto might add to the effects of blood thinners have not been borne out in most human research, and the small dips seen in seizure-drug levels did not clearly worsen seizure control.

Check your medications against Ketogenic Diet

Based on HelloPharmacist’s Ketogenic Diet interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Ketogenic Diet

259 medications have a known interaction with Ketogenic Diet, graded by severity. Select any drug for the full evidence-based detail.

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AI summaries are generated from our Ketogenic Diet interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

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What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Ketogenic Diet combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Ketogenic Diet affects

Every type of medication (drug category) Ketogenic Diet is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 6 drug categories Ketogenic Diet interacts with

AnticonvulsantsAntidiabetes DrugsCarbonic Anhydrase InhibitorsSodium-glucose Co-transporter 2 (sglt2) InhibitorsAnticoagulant/antiplatelet DrugsValproate

Anticonvulsants

Following the ketogenic diet may reduce the levels of certain anticonvulsants, although the clinical significance of this effect is unclear.
Pharmacokinetic research in patients chronically taking up to 4 antiepileptic drugs shows that following a modified Atkins diet for 4-12 weeks reduces the average anticonvulsant serum concentrations by 10.5% to 13.5% (range 7% to 19%) without affecting overall seizure control. Antiepileptic agents taken by these patients included carbamazepine, oxcarbazepine, topiramate, valproate, clobazam, nitrazepam, lamotrigine, zonisamide, and others. Levels of oxcarbazepine and levetiracetam did not seem to be significantly affected after the initiation of the ketogenic diet. Additionally, a small clinical study in children with drug-refractory epilepsy taking a variety of anticonvulsant medications shows that following a ketogenic diet for 12 weeks reduces serum concentrations of clobazam and its active metabolite desmethylclobazam, both by 38%, and lamotrigine by 15% without affecting overall seizure control. Levels of levetiracetam, topiramate, and valproic acid were not significantly reduced. Serum levels of anticonvulsants should be monitored in patients following a ketogenic diet.

Likelihood Possible Evidence D

Antidiabetes Drugs

Theoretically, following the ketogenic diet while using antidiabetes drugs might increase the risk of hypoglycemia.
The ketogenic diet involves a very low intake of carbohydrates, which can result in decreased blood glucose levels in patients taking antidiabetes drugs. In some patients, the need for antidiabetes drugs is reduced. Hypoglycemia has also occurred in some individuals without diabetes, although this is uncommon.

Likelihood Possible Evidence B

Carbonic Anhydrase Inhibitors

Theoretically, combining carbonic anhydrase inhibitors with the ketogenic diet can increase the risk of kidney stones.
Carbonic anhydrase inhibitors can increase the risk of kidney stones by worsening metabolic acidosis. The ketogenic diet can also increase the risk of metabolic acidosis and kidney stones. The combination of carbonic anhydrase inhibitors and the ketogenic diet seems to worsen metabolic acidosis in some patients. Bicarbonate levels should be measured in individuals on the ketogenic diet using carbonic anhydrase inhibitors.

Likelihood Possible Evidence D

Sodium-Glucose Co-Transporter 2 (Sglt2) Inhibitors

Combining SGLT2 inhibitors with the ketogenic diet can increase the risk of ketoacidosis.
The National Lipid Association Nutrition and Lifestyle Task Force recommends that patients following diets that restrict carbohydrates to 20-50 grams daily, such as the ketogenic diet, avoid taking SGLT2 inhibitors. This combination increases the risk of developing ketoacidosis.

Likelihood Possible Evidence C

Anticoagulant/Antiplatelet Drugs

Although there is some concern that the ketogenic diet might have additive effects when used with anticoagulant and antiplatelet drugs, most clinical research does not show this effect.
One small observational study found that the ketogenic diet was associated with prolonged bleeding times in 16 of 51 (31%) children with epilepsy who were also on chronic anticonvulsant therapy. However, a larger observational study of 162 children with epilepsy taking chronic anticonvulsants has found that following the ketogenic diet does not increase the risk of bleeding, even in the 25 children undergoing surgery. Research in adults also has not reported changes in bleeding time.

Likelihood Unlikely Evidence B

Valproate

There is some concern that the ketogenic diet might have additive hepatotoxic effects when used with valproate.
Valproic acid and the ketogenic diet are commonly combined in patients with epilepsy. However, hepatic dysfunction has been reported in children using the ketogenic diet, with evidence from some cases suggesting that the risk is increased in children also taking valproic acid. Tapering the medication and the diet has allowed for successful re-introduction of the diet in persons affected with liver injury. There is also some concern that combining valproic acid with the ketogenic diet might reduce the effects of both interventions. Valproic acid can inhibit ketosis in children using the ketogenic diet. In at least two cases, valproate levels in the blood were decreased by as much as 32% in adults using the ketogenic diet. However, these risks appear to be rare.

Likelihood Unlikely Evidence D

Monograph

Ketogenic Diet: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

The ketogenic diet is a very low-carbohydrate, high-fat eating plan that shifts the body to burn fat for fuel. It has the strongest evidence as a medical therapy for hard-to-treat epilepsy and may help short-term weight loss and blood sugar, but it can be hard to sustain and is not right for everyone. Talk with a doctor or pharmacist before starting, especially if you have a medical condition or take medication.

Common forms: Whole-food eating plan; sometimes paired with MCT oil or exogenous ketone supplements

People commonly use it for

Weight loss
Type 2 diabetes and blood sugar control
Drug-resistant epilepsy (especially in children)
Reducing appetite
Athletic and metabolic interest

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally manageable for healthy adults short-term, but it can cause side effects and is not safe for everyone.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using unless under medical advisement. In animal models, ketone bodies can cross the placenta and s...

Read the full pregnancy detail

BreastfeedingPossibly Unsafe

When used orally without medical supervision. While rare, there are several case reports of lactation ketoacidosis thought to be associated with adher...

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

The ketogenic diet (often called "keto") is an eating pattern that is very low in carbohydrates, high in fat, and moderate in protein. By cutting carbs sharply, the body runs low on its usual sugar fuel and begins making molecules called ketones from fat. This state is known as ketosis.

Keto is not an herb or supplement — it is a dietary approach. It was first developed in the 1920s as a medical treatment for epilepsy. Today people use it for many reasons, most commonly weight loss and blood sugar control. Some versions are very strict, while others (like "low-carb" or "modified Atkins") allow more carbohydrates.

People may follow keto on their own, but the strict, therapeutic versions used for epilepsy are usually carried out with close help from a doctor and dietitian.

How it works

When carbohydrate intake is very low, the body has less glucose (sugar) to use for energy. The liver responds by breaking down fat into ketone bodies, which many tissues — including the brain — can use as an alternative fuel. This metabolic state is called ketosis.

Researchers think the seizure benefits may come from changes in brain energy use and chemical signaling, though the exact mechanisms are not fully understood. For weight loss, keto may help by reducing hunger, lowering insulin levels, and cutting out many processed, carb-heavy foods.

Much of the detailed mechanism research comes from laboratory and animal studies, so not every proposed effect has been confirmed in people.

Effectiveness

Does Ketogenic Diet work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 28 uses evaluated

2 Possibly effective 26 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Possibly Effective Diabetes