Food and Beverage Interactions with Psychotropic Medications

Introduction and Overview of Food-Drug Interactions

• Raj Mago, MD, is the Editor-in-Chief of the website simpleandpractical.com and is involved in psychopharmacology education at universities in Syracuse and Philadelphia.

• The lecture addresses a specialized and often overlooked area of clinical practice: how food and beverages affect the absorption, metabolism, and side-effect profiles of psychotropic medications.

• The goal is to provide an encyclopedic overview of clinical nuances that a practitioner can use to optimize treatment and improve patient rapport.

Psychotropic Medications That Must Be Taken With Food

• A critical subset of psychiatric medications requires administration with food to ensure proper absorption. Failure to do so can result in the patient receiving significantly less than the prescribed dose.

• General Rule: Without food, approximately half ($50\%$) of the medication will not be absorbed into the bloodstream. This is functionally equivalent to halving the patient's dose regularly.

• Three Specific Medications:     - Lurasidone (Latuda): This is the most frequently prescribed medication in this category.     - Vilazodone (Viibryd).     - Ziprasidone (Geodon).

• Caloric Requirements:     - For Lurasidone, the FDA-approved labeling specifies at least $350\,kcal$.     - For Ziprasidone, it is not strictly specified by the FDA, but research generally points to at least $500\,kcal$.     - For Vilazodone, the specific calorie count is not specified in the labeling, but food is mandatory for absorption.

• Clinical Nuance on Calorie Counts:     - Patients often struggle with precise calorie counting; therefore, Dr. Mago suggests advising them to have a "substantial meal" or a sandwich rather than just a snack, such as a single cookie.     - The type of food (high fat vs. low fat) does not significantly impact these three medications; the absolute caloric intake is the primary driver of absorption.     - Example: A cheeseburger ($540\,kcal$) and a Southwest grilled chicken salad from McDonald's have roughly the same caloric impact on absorption.     - Dr. Mago notes that in his consultation work with treatment-resistant patients, he has seen zero patients who were aware they needed to take Lurasidone with food.

Medications Recommended Without Food: Quetiapine Extended Release (ER)

• While most meds are taken with food to reduce nausea, Quetiapine Extended Release (Seroquel XR) is recommended to be taken without food for a specific pharmacokinetic reason.

• Pharmacokinetics/Mechanism:     - Quetiapine Immediate Release (IR) and Quetiapine Extended Release (ER) provide the same total amount of drug (area under the curve), but food affects the peak concentration ($C_{max}$) of the ER version.     - Taking Quetiapine ER with a full or high-fat meal causes the peak level to spike significantly.     - Taking it without food "flattens the curve," reducing the peak level by approximately $60\%$.

• Side Effect Management:     - Most side effects—such as sedation and orthostatic hypotension—are related to the peak concentration of the medication.     - By taking it on an empty stomach, patients can tolerate higher doses (e.g., starting at $300\,mg$) without being incapacitated by sedation.

• Clinical Exceptions:     - If the primary goal of the medication is to treat severe insomnia (e.g., in bipolar disorder), taking Quetiapine ER with food may be beneficial to achieve a higher peak level and faster sedation results.     - Standard doses for this purpose might include $50\,mg$ or $150\,mg$.

The Impact of Food on Sleep Medications (Hypnotics)

• Most hypnotics (sleep medications) should ideally be taken on an empty stomach or without a significant meal.

• Zolpidem (Ambien):     - Food slows the absorption of Zolpidem, leading to a much longer time to peak level ($T_{max}$).     - If a patient eats a meal close to bedtime and then takes Zolpidem, the drug may not take effect for upwards of $2\,hours$, resulting in sleep-onset insomnia.     - The prescribing information explicitly states: "For faster sleep onset, Zolpidem should not be administered with or immediately after a meal."

Consistency in Administration: Buspirone and Paliperidone

• There are medications where food increases absorption, but not to the drastic degree seen with Lurasidone.

• Buspirone and Paliperidone (Invega):     - Because food increases the level of absorption, the most important clinical advice is consistency.     - Patients must decide to take the medication either always with food or always without food to avoid fluctuating blood levels.

Vitamin C and Amphetamines

• Vitamin C (Ascorbic Acid) has a significant interaction with Amphetamines (e.g., Adderall, Vyvanse, Dexamphetamine).

• Mechanism:     - Large quantities of Vitamin C or acidic juices (like orange juice) make the urine acidic.     - In acidic urine, the renal excretion of amphetamines is significantly increased.     - High doses of Vitamin C can increase the excretion rate of amphetamines by roughly $60\%$, lowering blood levels and efficacy.

• Dosage Specifics:     - A typical Multivitamin contains the RDA of roughly $60\,mg$ of Vitamin C.     - Modern "immune support" supplements (e.g., Emergen-C, Airborne) often contain $1000\,mg$ taken up to three times a day ($3000\,mg/day$).     - This high dosage can cause a patient to "pee right out" their stimulant medication.

• Clinical Recommendation:     - If a patient requires high-dose Vitamin C and an ADHD medication, Methylphenidate (e.g., Ritalin, Concerta) is preferred because its excretion is not affected by urinary pH in the same way amphetamines are.

Caffeine, Smoking, and Cytochrome P450 1A2

• The enzyme CYP1A2 is central to the metabolism of Clozapine and Olanzapine.

• Caffeine:     - Caffeine is an inhibitor of 1A2. By inhibiting the enzyme, caffeine causes blood levels of Clozapine to rise.     - Toxicities associated with elevated Clozapine levels include QT prolongation, cardiac arrhythmias, hypotension, and bradycardia.     - Consumption of more than $400\,mg$ of caffeine (the amount in approximately two large Starbucks coffees) is the threshold for significant interaction.     - If a patient suddenly stops a heavy caffeine habit, their Clozapine levels will drop because the 1A2 enzyme is no longer inhibited and becomes more active.

• Smoking:     - Smoking (specifically the hydrocarbons in tobacco smoke, not nicotine) is an inducer of 1A2.     - Smokers often need up to four times more coffee to feel an effect because their 1A2 enzyme is hyper-induced.     - When a smoker is hospitalized (inpatient) and forced to quit smoking, their 1A2 activity drops, causing Clozapine levels to skyrocket, which can be dangerous.     - Conversely, if a patient leaves the hospital and resumes smoking, Clozapine levels will plummet, often leading to relapse.

Lithium and Caffeine Interaction

• Caffeine acts as a diuretic and increases the renal excretion of Lithium.

• Result: Higher caffeine intake leads to lower Lithium levels.

• Clinical Observation: Decreasing caffeine intake can cause Lithium levels to rise. Mago cites a study titled "Drinking Less and Shaking More," where reducing caffeine increased Lithium levels and subsequently worsened Lithium-induced tremors.

Grapefruit and Cytochrome P450 3A4

• Grapefruit and grapefruit juice inhibit the CYP3A4 enzyme, which is located in both the liver and the intestinal lining.

• Timing and Duration:     - Even a single cup of grapefruit juice starts inhibiting 3A4 within hours.     - The effect lasts a long time because the enzyme is permanently bound; the body must manufacture new enzymes. Inhibition is reduced by $50\%$ after $12\,hours$ but can persist for up to $3\,days$.

• Affected Medications:     - Buspirone: The most drastically affected. Levels can increase by nine times ($9\times$).     - Diazepam (Valium): Exposure increases by approximately three times ($3\times$).     - Carbamazepine (Tegretol): Significant increase in levels.     - Lurasidone and Quetiapine: Both are metabolized by 3A4. Medscape lists the Lurasidone interaction as "serious" and suggests avoiding the combination.     - PDE5 Inhibitors (e.g., Viagra/Cialis): Levels will increase, potentially increasing both efficacy and side effects.

Dietary "Leftovers" and Herbal Interactions

• Cruciferous Vegetables (Broccoli, Cabbage, Cauliflower, Radicchio): These are 1A2 inducers. A massive increase in intake can lower Clozapine levels.

• Charcoal Grilled Meat: Also an inducer of 1A2; daily barbecuing can affect Clozapine metabolism.

• Turmeric and Cumin: These are 1A2 inhibitors. High-dose turmeric capsules (curcumin) can cause Clozapine and Olanzapine levels to rise.

• Chamomile Tea: Hits the 3A4 system and increases the effects of sedatives like benzodiazepines, Z-drugs (Zolpidem, Eszopiclone), and Buspirone. This may theoretically assist with sleep via a pharmacokinetic boost to hypnotic medications.

Summary Checklist for Clinical Practice

• Take with Food: Lurasidone, Vilazodone, Ziprasidone.

• Take without Food (Standard): Quetiapine ER, Zolpidem (and other hypnotics).

• Watch for Caffeine/Smoking: Clozapine, Olanzapine, Lithium.

• Avoid Grapefruit: Buspirone, Carbamazepine, Lurasidone, Diazepam.

• Medication History Best Practice: Ask patients three times about their intake, specifically separating questions into:     1. Prescriptions.     2. Over-the-counter (OTC) medications and supplements (e.g., Vitamin C).     3. Herbal medications (e.g., Turmeric, Chamomile).