Can You Take Alprazolam and Ketoconazole Together?

No. The FDA classifies the combination of alprazolam and ketoconazole as contraindicated, meaning these two drugs should not be taken together. When ketoconazole is given with alprazolam, plasma concentrations of alprazolam become elevated, leading to a documented risk of enhanced sedation. This is a serious interaction that requires immediate medical attention if you are currently taking both drugs.

What the Source Says

According to the FDA drug label for alprazolam, ketoconazole is explicitly listed among drugs that are contraindicated with alprazolam. The source material states:

"Coadministration of ketoconazole tablets with oral triazolam, oral midazolam or alprazolam has resulted in elevated plasma concentrations of these drugs. Concomitant administration of ketoconazole tablets with oral triazolam, oral midazolam or alprazolam is contraindicated."

This language appears in the PRECAUTIONS: DRUG INTERACTIONS section of the official FDA labeling. The designation of "contraindicated" is the highest level of warning for drug interactions and means the combination carries significant clinical risk and should be avoided altogether.

The interaction record identifies the documented effect as enhanced sedation—a direct consequence of elevated alprazolam levels in the bloodstream when ketoconazole is present.

How to Understand This

What Alprazolam Does

Alprazolam is a benzodiazepine, a class of medication used to treat anxiety and panic disorders. It works by slowing activity in the central nervous system, producing a calming effect. Benzodiazepines are carefully dosed because their effects—sedation, reduced anxiety, muscle relaxation—are dose-dependent. Too much sedation can lead to drowsiness, impaired coordination, confusion, and in severe cases, respiratory depression.

What Ketoconazole Does

Ketoconazole is an antifungal medication used to treat fungal infections. It works by interfering with fungal cell wall formation.

Why They Don't Mix: The Documented Effect

The FDA drug label for alprazolam explicitly documents that when ketoconazole is taken with alprazolam, the plasma concentration of alprazolam increases. This means more alprazolam circulates in the bloodstream than would occur if alprazolam were taken alone at the same dose. Higher alprazolam levels directly produce stronger sedative effects, which is why the interaction is described as "enhanced sedation."

The source record does not specify the precise mechanism by which ketoconazole causes alprazolam levels to rise. However, general pharmacology knowledge indicates that ketoconazole is known to interact with drug-metabolizing enzymes in the liver. When such enzymes are inhibited, drugs that depend on those pathways for breakdown accumulate in the body. Alprazolam is among the drugs affected by this type of interaction, but the source record provided does not elaborate on the specific enzymatic pathway involved in this pair.

Why Enhanced Sedation Matters

Elevated alprazolam levels and the resulting enhanced sedation can cause:

• Excessive drowsiness and reduced alertness
• Impaired coordination and balance
• Confusion and cognitive impairment
• Slowed breathing (in severe cases)
• Increased risk of falls and injury
• Difficulty performing tasks requiring concentration, such as driving

Because the interaction is documented and predictable, and because enhanced sedation carries significant safety risk, the FDA explicitly recommends against this combination altogether rather than suggesting dose adjustment or monitoring strategies.

Who Should Pay Particular Attention

Anyone currently taking both alprazolam and ketoconazole should prioritize an urgent conversation with their prescribing physician or pharmacist. Because this is a contraindicated combination, there is no safe way to use both drugs simultaneously.

People with the following characteristics may face additional concern if they are exposed to this interaction:

• Older adults, who often have reduced drug-metabolizing capacity and are more sensitive to benzodiazepine effects
• People with liver disease or reduced liver function, since both drugs are processed by the liver
• People taking other sedating medications (such as opioids, other benzodiazepines, sleep aids, or certain antidepressants), which could compound the sedative effect
• People who drive or operate heavy machinery, for whom impaired cognition and coordination pose safety risks
• People with respiratory conditions, since benzodiazepine-induced respiratory depression is a serious concern

However, the fundamental issue is not that some people are at higher risk—it is that the combination is contraindicated for everyone. The documented interaction applies to all patients, and alternative approaches should be pursued for all.

Hypothetical Scenarios

Scenario 1: A Patient Already on Both Drugs

Suppose a patient has been taking alprazolam for anxiety for several months and is then prescribed ketoconazole to treat a fungal infection. The patient might think: "I'm already on alprazolam, and the doctor is prescribing ketoconazole, so it must be safe." However, the FDA labeling makes clear this is not safe. Once ketoconazole is added, alprazolam levels will begin to rise, and the patient may experience excessive drowsiness, difficulty concentrating, or other signs of enhanced sedation within days. This is why the prescribing physician must be aware of all current medications before initiating ketoconazole, and why the patient must inform the ketoconazole prescriber about existing alprazolam use.

Scenario 2: A Patient Seeking to Continue Both Drugs

A patient might ask their doctor: "Can we just lower my alprazolam dose if I start ketoconazole?" While dose adjustment is a strategy for some drug interactions, the FDA labeling for this pair does not recommend dose reduction as a safe alternative. The designation of "contraindicated" means the combination should be avoided entirely, not managed through dosing adjustments. The appropriate response is to find an alternative antifungal medication (in consultation with the prescriber) or to temporarily pause alprazolam while ketoconazole is needed, depending on the clinical situation.

What to Discuss With a Pharmacist or Physician

If you are taking alprazolam and have been prescribed ketoconazole, or vice versa, bring this up with your healthcare provider or pharmacist immediately. Here are key questions and topics to raise:

• "I'm taking alprazolam for anxiety. Why is ketoconazole contraindicated with it?" Your provider can explain the specific clinical context and confirm that the contraindication applies to your situation.
• "Are there alternative antifungal medications I could take instead of ketoconazole?" Other antifungal agents may have less risk of interaction with benzodiazepines. Your provider can discuss alternatives based on the type and severity of your fungal infection.
• "If I need ketoconazole, should I stop taking alprazolam, and if so, for how long?" Stopping a benzodiazepine abruptly can cause withdrawal symptoms, so this requires a structured plan. Only your prescriber can advise on timing and any dose tapering needed.
• "How long does ketoconazole treatment typically last?" Understanding the duration helps you and your provider plan the best approach—whether that is a temporary pause in alprazolam or an alternative to ketoconazole.
• "Are there any other medications I'm taking that might also interact with ketoconazole?" Ketoconazole is a strong inhibitor of liver enzymes and interacts with many drugs beyond alprazolam. A comprehensive medication review is important.
• "If I experience excessive drowsiness, confusion, or difficulty breathing while on these medications, what should I do?" Your provider should give you clear instructions on when to seek emergency care.

Do not attempt to adjust your doses, stop either medication, or switch medications on your own. These decisions must be made in partnership with your prescribing physician or pharmacist, who can weigh the risks and benefits specific to your health situation and recommend the safest path forward.

Key Takeaways

• Alprazolam and ketoconazole are contraindicated by FDA labeling. This is the strongest level of warning and means the combination should not be used.
• Ketoconazole raises alprazolam levels in the bloodstream, causing enhanced sedation, drowsiness, impaired coordination, and potential respiratory depression.
• The interaction is documented fact, not theory. The FDA explicitly states that coadministration has resulted in elevated alprazolam concentrations and is therefore contraindicated.
• If you are taking both drugs, contact your prescriber or pharmacist urgently. Do not wait for side effects to develop; this is a situation that requires proactive medical intervention.
• Alternative antifungal medications or a temporary pause in alprazolam may be necessary. Your healthcare provider can help identify the safest approach for your specific fungal infection and anxiety management.

Sources

DailyMed: FDA Drug Labeling Database — The source for alprazolam drug label information, including PRECAUTIONS: DRUG INTERACTIONS section.

RxNorm: Normalized Naming System for Clinical Drugs — NLM/NIH resource for drug identification and standardized drug name information.

OpenFDA: FDA Drug Information Portal — Searchable access to FDA drug labeling and adverse event data.

PubMed: National Center for Biotechnology Information — Peer-reviewed literature database for clinical evidence on drug interactions.

Check Your Medication List and Confirm With Your Healthcare Provider

This article explains what the FDA source record documents about the alprazolam and ketoconazole interaction. It is educational only and does not replace advice from your pharmacist or physician. If you are taking either of these medications, or if you have been prescribed both, visit checkdruginteractions.com to review your complete medication list for documented interactions. Then confirm all medication decisions—including whether to start, stop, adjust, or substitute any drug—with your pharmacist or prescribing physician. Your healthcare provider knows your full medical history and can advise on the safest approach for your specific situation.