Last Updated on June 11, 2026

The best time to take naltrexone is one hour before your strongest craving window or your first drink of the day. For daily dosing, that means a consistent time each afternoon or evening for most people. For targeted dosing (the Sinclair Method), it means 60 to 90 minutes before every drinking occasion, without exception.

You get the prescription. The instructions say “take once daily.” Then, you find yourself wondering: Does the timing matter? 

Should naltrexone be taken in the morning or at night? What happens if you drink several hours after taking it? And why do some people online talk about taking it one hour before drinking?

The confusion stems from the fact that naltrexone can be used in different ways. Some people, including Sunnyside Med users, take it daily as part of a broader treatment plan. Others use a targeted approach.

What they have in common is that timing matters. Naltrexone works by blocking opioid receptors involved in alcohol’s rewarding effects, so understanding when the medication is active can help you get the most benefit from it.

Below, we’ll walk through how to find the right naltrexone timing for you— including what the pharmacokinetic data actually shows, how daily and targeted dosing differ, and what the Sunnyside Med protocol looks like in practice.

The Two Ways to Take Naltrexone

Both approaches use the same medication with a different dosing protocol.

• Daily dosing means taking naltrexone every day, whether or not you plan to drink. The goal is consistent receptor occupancy and gradual craving reduction. This is Sunnyside Med’s approach.

• Targeted dosing means taking it specifically before drinking occasions. This is widely known as the Sinclair Method. The goal is “pharmacological extinction”: blocking the reward signal each time you drink so your brain gradually unlearns the craving. 

Both approaches have been studied. The right approach depends on your drinking pattern and your goals. (Check out Sunnyside’s comparison of daily vs. targeted dosing for more information.)

Daily Naltrexone: When to Take It and Why It Matters

Naltrexone is absorbed quickly after you take it. Peak blood levels occur within about one hour, and the active metabolite, 6-beta-naltrexol, has a longer half-life of roughly 13 hours. That means the medication remains active well beyond the first hour, but timing still matters.

Many people are told to take naltrexone once daily, often in the morning with food. That can work well if morning dosing helps you stay consistent, and taking it with food may help reduce nausea.

But for people whose cravings or drinking typically happen later in the day, morning dosing may not be the best fit. If you take naltrexone at 7 a.m., for example, the medication is still in your system by evening, but its most powerful window has passed by the time many people hit their highest-risk hours.

That is why Sunnyside Med focuses on consistency and timing. The protocol is to take naltrexone daily, with food, at a consistent time, ideally about one hour before your usual craving window or first drink. For some people, that means late morning. For others, it means early afternoon or evening.

Evening dosing may also work better for people who experience early side effects, since some find it easier to sleep through nausea or fatigue during the first few weeks. Remember: Any timing change should be discussed with your care team, especially if side effects persist or your drinking pattern changes.

Take Your Naltrexone 1 Hour Before Your Craving Window or First Drink

This is the single most important piece of naltrexone timing advice. 

Your craving window is the time of day when you feel the strongest urge to drink. For most people, that’s late afternoon or early evening. It could also be when you walk through the door after work, or when your kids go to bed. It’s different for everyone, but what’s important is to identify that window, set an alarm for an hour before it. When the alarm goes off, take your naltrexone with a snack. Done.

Not Feeling It? Try Adjusting Your Naltrexone Timing

We’ve talked to dozens of Sunnyside Med clients who were taking their medication in the morning or before sleep and wondering why it wasn’t working. Then, when they switched to one hour before their craving window or first drink, they started to notice results.

“Yesterday, when work finished at 5:00, my witching hour, I felt a strong craving… I then remembered it was time to take the pill,” said one person. “I grabbed it and drank water and then went home … didn’t even think about wine when I got home.”

The medication was the same, but the timing made a meaningful difference.

Targeted Naltrexone Timing

This is the Sinclair Method’s basic rule: Take naltrexone 60 to 90 minutes before your first drink, every drinking occasion, every time.

The timing matters because naltrexone needs time to reach effective levels in the body before alcohol arrives. The goal is for opioid receptors to be blocked when drinking begins, allowing the brain to gradually weaken the learned association between alcohol and reward.

This is why timing becomes such a focus in Sinclair Method communities. One r/SinclairMethod user put it this way: “NAL is ideally taken 60-90 minutes before drinking. You HAVE TO wait the full hour, or it won’t work. It’s effective for 6-10 hours.”

The wording is a little bit stronger than the science there, but the underlying point is sound: Consistency matters. Taking naltrexone before drinking is what makes the protocol work.

What if drinking is unplanned? Many experienced Sinclair Method users carry naltrexone with them for exactly that reason. In Sinclair Method terminology, every drinking session should be a “protected session.”

What Happens If You Miss a Naltrexone Dose

It’s not ideal to miss a naltrexone dose, but it’s also not the end of the world. How to handle a missed dose depends on whether you’re taking it daily or using targeted dosing.

What If You Miss a Daily Dose?

If you miss a daily naltrexone dose, take it as soon as you remember, even if you’re two drinks in. If it’s close to your next scheduled dose, skip the missed one and continue as normal. Never double up.

One missed dose doesn’t undo your progress. Consistency is key, but perfection isn’t required. Miss one, take the next one.

What If You Miss a Targeted Dose?

The stakes are different here. If you don’t take naltrexone before drinking, pharmacological extinction doesn’t happen in that instance. Your brain gets the full dopamine reward of drinking, and the unlearning process pauses.

This is not the end of the world! It’s important that you don’t take your naltrexone dose after you’ve already started drinking. The point is to have receptors blocked before alcohol arrives.

Going on Vacation? Drinking Earlier Today? Adjust Your Timing!

Your naltrexone timing doesn’t have to be the same every day. Pool party starting at noon? Take it at 11 am. Cravings arriving earlier, but only on weekends? Shift your dose earlier on those days. 

Remember: the medication is there to work for you, so that you have the space to build new patterns and habits.

How Food Affects Naltrexone Timing

Nausea is the most common early side effect of naltrexone, though only 10-30% of people experience it. There’s a solid chance you won’t! If you do, though, taking naltrexone with food may help reduce that nausea. FDA prescribing information recommends taking naltrexone after meals if gastrointestinal side effects occur. 

A 2022 pharmacokinetic study also found that food altered naltrexone exposure, supporting the idea that taking the medication with food may improve tolerability. (While the study was conducted in an eating disorders population, the underlying pharmacology is likely relevant across populations.)

If morning dosing causes nausea, you might find that taking naltrexone in the evening, at least at first, allows you to sleep through the worst of the initial side effects.

How Your Naltrexone Timing Preference May Evolve Over Time

Your naltrexone timing preferences will likely evolve as you learn how your body and mind react to the medication. Here’s a hypothetical timetable:

• Weeks 1 to 2: Side effects (like nausea) are most likely. Dose timing relative to food matters most during this period.

• Weeks 3 to 6: Side effects usually resolve. Focus shifts to timing relative to your craving window.

• Months 2 to 3: Craving patterns start shifting. The window in which the urge to drink feels most urgent may narrow. Adjustment to dose timing may still be necessary, though, so be sure to keep tracking, monitoring, and discussing with your care team.

“I used to have to take [naltrexone] in the morning because that’s when my first urges would hit,” one Sunnyside member said. “I’m not getting those urges in the morning anymore.”

Think of the “right time” to take naltrexone as a point you adjust as your relationship with alcohol changes. Daily tracking in the Sunnyside Med app provides useful feedback: You see what’s working, which means you have the information you need to make adjustments.

How to Start: Sunnyside Med’s Protocol for Naltrexone Timing

Sunnyside Med uses compounded naltrexone with Vitamin B6, taken daily, with food, at a consistent time, and tracked in the app.

The program starts at a lower dose during the first week before gradually increasing to the full dose. This gives your body time to adjust and may help reduce early side effects that often cause people to quit before the medication has a chance to work. Vitamin B6 is included to support energy and mood during the adjustment period. 

What the Research Says

Sunnyside Med’s design takes into account the reality that, for naltrexone, adherence is often the difference between success and failure.

Clinical trials have shown for decades that naltrexone can reduce heavy drinking; the challenge is not whether naltrexone works. The challenge is helping people stay on it consistently enough for it to work.

Percy Menzies, a pharmacist and alcohol treatment specialist, has argued that this was the central lesson of naltrexone’s early history: “Naltrexone was not so much a failure of its pharmacology as a failure of its delivery … If adherence limits efficacy, adherence becomes the intervention.”

Dr. Joseph Volpicelli, who led pioneering research on naltrexone at the University of Pennsylvania, reached a similar conclusion with his team—that “the clinical efficacy of naltrexone could be improved by enhancing treatment compliance.”

The largest naltrexone trial ever conducted pointed in the same direction. In the landmark COMBINE study, participants who received medication alongside structured medical management achieved better outcomes than medication alone would be expected to produce in routine care. The finding reinforced an idea that now seems obvious: medication works best when people have support, accountability, and a plan for staying engaged.

That’s the thinking behind Sunnyside Med. The medication is important, but so is everything surrounding it: gradual onboarding, daily tracking, care-team support, and a system designed to help members keep going through the adjustment period.

As one member put it: “I started Sunnyside Med a week ago. For me, it really works. It is the small thing I can do every day, repeat, and build real change.”

If you’re ready to get your naltrexone timing right and build a system that keeps you on track, Sunnyside Med can help you see if you’re eligible with a 2-minute quiz at joinsunnysidemed.com.

Naltrexone is a prescription medication. This content is educational and should not be taken as medical advice. A licensed clinician reviews every Sunnyside Med application.

Frequently Asked Questions (FAQ)

When should I take naltrexone?

Take naltrexone one hour before your strongest craving window or your first planned drink. For most people taking a daily dose, this means late afternoon or early evening. The goal is to have the medication active during your highest-risk hours, not first thing in the morning.

Should I take naltrexone with food?

Taking naltrexone with food can reduce nausea, which is the most common naltrexone side effect in the first two weeks (though you might not experience it at all!) The FDA label recommends taking naltrexone with meals to reduce GI side effects.

Can I adjust the time I take naltrexone?

Yes—just chat with your clinician beforehand. Your naltrexone timing can shift as your craving patterns change, your schedule changes, or you travel. The key is to keep the one-hour-before-craving-window rule consistent, even if the clock time moves.

How can Sunnyside Med help me decide on naltrexone timing?

Sunnyside Med‘s daily tracking helps you identify craving patterns and optimize your dosing time. Your care team can also answer questions about timing, side effects, and adjustments at any point. Learn more at joinsunnysidemed.com.

Sunnyside Is the Perfect Companion for Your Naltrexone Journey

Sunnyside is the #1 mindful drinking app. Since 2020, we’ve been honing our harm-reduction approach and have helped over 400,000 people cut out 22 million drinks from their baseline habits. 96.7% of our members report success drinking less, and in a third-party study, our approach was demonstrated to reduce weekly drinking by 33% after 12 weeks. 

Think of Sunnyside as the front door for anyone who wants to change their relationship with alcohol. If you want to drink less, we can help you get there. If you want to eventually quit, but want to take a gradual approach, we can make that happen.

When you sign up for Sunnyside, you’ll take a quick 3-minute personalization quiz, then hop into the app. It’s as simple and quick as that. 

We’ll give you weekly plans to gradually reach your drinking goals, and we’ll provide nudges, coaching, exercises, and advice to help you get there. 

We have daily tracking and journaling tools, including the option to chat with a real human coach. And, of course, we have great analytics so you can track your progress over time. 

Sunnyside is a full-featured mindful drinking app, and thus the perfect companion for your Naltrexone journey. Naltrexone will actively help you reduce cravings around alcohol, and Sunnyside will help you understand your triggers and patterns, giving you a healthy system for habit change. 

Everyone who signs up for Sunnyside gets a free 15-day trial, then the subscription is $8.25/month, less than the cost of a fancy drink. And the best part is our members save an average of $50 per month, easily paying for the cost of the subscription.

Whether you’re currently taking naltrexone or just doing some research on alcohol moderation, we’d love to have you sign up for our 15-day free trial today.