Last Updated on September 20, 2021

When you peruse the alcoholism medication-assisted treatment online communities (yes, they exist!), you’ll probably come across the term “nalover.” It’s a mash-up of “naltrexone”—an anti-craving medication used daily or, per the Sinclair Method, one hour before drinking—and “hangover.” Basically, it’s the hangover some people experience after drinking on naltrexone, and it’s a phenomenon that has yet to be studied at all in the medical community.

So we decided to investigate. We recently surveyed Reddit and Facebook users who take naltrexone about their nalovers: Do they get them? How often? How bad are they? And what are their symptoms? While our results aren’t exactly conclusive—we only surveyed 58 people in a non-clinical setting, and we don’t know if ours was a representative sample because our respondents were anonymous—they’re a good start. See below for a round-up of our data.

Nalover Survey Results: How Severe and How Often?

It’s important to note that more than a third of our survey respondents had never had a nalover:

How many times have you had a nalover?


The rest of the data you’ll see is only from the 36 respondents who have had at least one nalover. Their nalovers tended to be moderate-to-severe—at least slightly more severe than a normal hangover.

How severe is your typical nalover?

How does your nalover compare to a "normal" hangover?

On average, our respondents’ nalovers started 12.3 hours after taking naltrexone. That timeframe corresponds to a typical hangover, which normally occurs the morning after a night of drinking.

We asked how long respondents’ nalovers tended to last. Answers ranged from 2 hours to 24 hours; the mean response was 8.4 hours.

About 22 percent of respondents said they get a nalover every time they drink after taking naltrexone, no matter how much or how little they drink. The same percentage said that whether they get a nalover depends on how much they drink—the more they drink, the more likely they are to get a nalover the next day.

What Are the Symptoms of a Nalover?

We asked survey-takers to rate their nalover symptoms on a scale from “none” to “severe.” Here’s how they rated each symptom (again, we’ve only included responses from people who said they’ve had at least one nalover):







Dizzy or faint


Loss of appetite


Stomach ache





Heart racing


Here are all of those symptoms on the same graph, so you can easily see which were the most common. First, here are the percentages of people who reported having had any of the following symptoms:

Any Symptoms

And here are the percentages of people who reported moderate-to-severe symptoms:

Moderate-to-Severe Symptoms

As you can see, fatigue was the most common symptom overall, as well as the most common moderate-to-severe symptom. Thirst, headache, loss of appetite, and nausea were also common. Vomiting was by far the least common symptom. A couple respondents reported insomnia or sleep disturbances, while others reported diarrhea, depression, anxiety, and sweaty palms. Now that we have some idea of what a nalover is, we’re looking forward to further investigating this little-known phenomenon.

Do you want to change your relationship with alcohol? Don’t let the prospect of nalovers deter you! We’ve found that people who take naltrexone overwhelmingly recommend it to others. Plus, there are plenty of other medications out there besides naltrexone that are proven to significantly lower cravings and alcohol intake. In fact, on average, Ria Health members reduce their drinking by 70 percent in the first six months. Contact us to get started today!

Paul Linde
Medically reviewed by:
Clinical Supervisor/Psychiatrist
Published researcher and author with over 25 years experience in emergency psychiatric care.
Written By:
Director of Community Outreach
Leading video blogger and advocate for medication-based treatment for alcohol use disorder.
Edited by:
Content Writer/Editor
Writer specializing in targeted, informative content. Dedicated to making the abstract accessible.

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