Naltrexone For Opioid Use Disorder and Alcohol Use Disorder

MOA: mu opioid receptor antagonist which prevents exogenous opioids from binding blocking the pleasurable effects of opioid use. Reduces alcohol consumption through modulation of the opioid system, blocking the reinforcing effects of alcohol. 

FDA Indications: alcohol use disorder (oral or injectable), Prevention of relapse to opioid dependence (injection)

Oral Dose: 50 mg/day 

Injection Dose: 380 mg/month 

Caution: patient must be opioid free for 7-10 days prior to starting, conformed with a negative urine 

For alcohol use disorder start with 50 mg/day or 380 mg/month for IM formulation (injection may be preferred because it eliminates the daily decision to take the medication) 

Side effects: nausea, vomiting, decreased appetite, dizziness, injection site reaction, life-threatening side effect is hepatocellular injury in overdose 

Who is it good for?: Those ready to abstain completely from alcohol and for binge drinkers. Good evidence for reducing heavy drinking days. There is some risk of apathy or loss of pleasure with chronic use. The combination of naltrexone and bupropion has been used as a treatment for obesity. 

Psychotropics: Acamprosate For Alcohol Use Disorder

I received a question asking me to discuss acamprosate as a medication and specifically to address any evidence to support its use to reduce urges to self-harm. I did the research, and this is what I found. 

Ketamine for Alcohol Use Disorder

In a previous post we discussed the details of Esketamine and the important things patients need to know about the medication. In this post I will discuss the experimental treatment for problematic drinking that involves a single infusion of ketamine. Now I know what you might be thinking. Here we go again, psychiatrists using a medication with potential for addiction on patients already struggling with addiction. It seems like we are just substituting on drug for another drug. Before we get too excited let’s look at the evidence. 

The study looked at 90 heavy drinkers, which all had a score greater than 8 on the Alcohol Use Disorder Identification Test but did not have a formal diagnosis of alcohol use disorder. Bottom line, the people in the study were drinking a lot but were not diagnosed with a use disorder. 

The study participants received a single dose of intravenous (IV) ketamine along with cognitive behavioral therapy (CBT) that focused on “maladaptive reward memories” (MRMs). The idea behind the combination of ketamine and CBT is that it works to reboot the brains reward pathway which has been overrun by excessive drinking. The ketamine infusion sets the stage for the CBT and allows the patient to relearn new more adaptive associations in relation to alcohol. In the study the combination of ketamine and CBT resulted in a 50% reduction in weekly alcohol consumption at 9 months. 

We know the reward system in the brain in suspectable to alterations and disordered function in the presence of substance use. Environmental triggers become associated with drug use, and these associations can be difficult to change. It’s essential to interrupt these reward memories and learn new healthy associations to prevent relapse. This is where the single ketamine infusion comes in. A promising method to break these associations is by interrupting the process of memory reconsolidation. These memories rely on N-methyl D-aspartate receptors (NMDAR) and ketamine acts as an antagonist (blocker) of these receptors. Theoretically ketamine should weaken the memories and make it easier to form new associations. Once the brain is susceptible to forming new associations the patient would be forming new associations with the help of the CBT protocol. Thus, the two therapies work in combination with each other. The ketamine acts as a primer setting the stage for new learning and the CBT helps to form new health associations.

My Take

I actually have some experience with the use of a single ketamine infusion in opioid use disorder along with transcranial magnetic stimulation, and a mindfulness-based CBT protocol. The concept was essential the same, just applied to opioid use disorder. I think treatments like this have potential. Clearly more studies are required before this treatment is available to larger patient populations. Alcohol remains a major cause of morbidity and mortality worldwide. We are looking for treatments that work and are going to enhance the lives of our patients. Time and more research will tell what impact this treatment has on addiction medicine, but it remains an exciting new approach. 

Choose Your Words Wisely: How We Talk About Addiction Matters

An important discussion we need to have is about the impact of language on stigma in addiction treatment. Language is powerful and labels are sometimes lifelong sentences. As physicians we can choose the language we use when talking with patients and about patients. How can we start to reduce this stigma by replacing harmful language?

  1. Replace the words drug addictdrug abuser, with words like patient with opioid use disorder 
  2. Replace Opioid abuse or dependence with opioid use disorder
  3. Replace problem with disease or illness 
  4. Replace dirty urine with positive or negative urine test 
  5. Replace Relapse with return to use
  6. Replace being clean with remission
  7. Replace Medication assisted therapy with opioid agonist treatment or medication for opioid use disorder

Language is powerful and can influence the perception of addiction and treatment. There have been several advocacy campaigns to change the way we talk about addiction. Friendly reminder to choose your words carefully, it may make a significant difference in peoples lives. 

Addiction 101: Making the Diagnosis

Chances are high that you know someone with an addictive disorder. This article provides information on how we diagnose addictive disorders and the symptoms included in substance use disorder diagnoses.

Diagnosing addictive disorders is based on the Diagnostic and Statistical Manual of Mental Disorders aka DSM, which is currently on version 5. The DSM is considered the Bible of psychiatry (be on the look-out for a forthcoming article on the storied history of the DSM, it’s more dramatic than you might think). First, let’s address which substance use disorders are currently included in the DSM.

1. Alcohol

Self-explanatory. Beer, wine, liquor, hand sanitizer (yup, I’ve seen it).

2. Caffeine

That’s right, caffeine use disorder is a psychiatric diagnosis. It’s a substance that produces psychological and physiological effects in the body and is frequently overlooked. This includes coffee, tea, diet coke, monster energy drinks, and the list continues. Some over the counter supplements contain caffeine such as popular pre-workout drinks. It’s a sneaky chemical and found in many foods and beverages.

3. Cannabis aka marijuana

Consumed in various ways. Comes from the various parts of the cannabis sativa or cannabis Indica plant. There is a frequent misconception that “marijuana isn’t addictive.” While marijuana doesn’t typically have a withdrawal syndrome, it most certainly is included in the list of substances that may result in substance use disorders.

 4. Hallucinogens

Hallucinogens are divided into classic and dissociative hallucinogens. The classic category includes drugs like LSD, psilocybin (magic mushrooms), peyote, and DMT (ayahuasca.) Examples of dissociative hallucinogens include PCP, ketamine, dextromethorphan (found in cough syrup), and salvia. They can be used in a variety of ways and generally alter awareness and perception.

5. Inhalants

Okay so this is a really random category because it may include so many things. Basically, anything that can be inhaled and shouldn’t be. Spray paint, gasoline, whipped cream bottles, cleaning spray, lighters. If it is a substance that gets inhaled, it falls in this category.

6. Opioids

Makes the news all the time due to the high risk of overdose death. Includes drugs like Percocet, OxyContin, heroin, and fentanyl. May be taken by mouth, snorted, or injected. The respiratory arrest caused by these drugs is reversed by a drug called Narcan or naloxone, which is administered via injection or nasal spray.  

7. Sedatives/Hypnotics/Anxiolytics

This category encompasses CNS depressants including the ever-popular benzodiazepines (such as Xanax and Valium). Also includes sleeping medications such as Ambien as well as some old school medications like phenobarbital. (Fun fact: butalbital, a barbiturate related to phenobarbital, is one of the ingredients in a prescription headache medicine Fioricet, in combination with Tylenol and our friend caffeine.)

8. Stimulants

Most famous drug of abuse stimulant first: cocaine. My favorite song about cocaine is White Lines by Grandmaster Flash and the Furious Five. Give it a listen. White Lines on YouTube. Methamphetamine (crystal meth) is probably the second most well-known stimulant, sensationalized by the popular show Breaking Bad. Other drugs of abuse in this category include medications for ADHD such as Adderall.

9. Tobacco

Cigarettes, dip, vaping. Perhaps the deadliest of the drugs of abuse. According to the American Academy of Addiction Psychiatry, tobacco use disorder is the most common substance use disorder and affects 60-80% of smokers. (Reference) This drug has been directly linked to a number of cancers, stroke, blood clots, heart disease, and lung disease and causes a tremendous burden to public health.

10. Other

Catch-all for any other drugs that meet criteria for a substance use disorder. Continually evolving.

Bonus: Gambling

Gambling is the only behavioral addiction currently included in the DSM although internet gaming and hypersexual disorders are under investigation. 


Next – how are these disorders diagnosed? Contrary to what you may think, quantity of drug consumed and frequency of use aren’t included in the diagnostic criteria. The mandatory component to diagnosing a substance use disorder is that the drug use leads to significant impairment or distress. If there is no impairment in life functioning or distress, there is no substance use disorder, regardless of whether the behavior upsets others.

In addition to functional impairment, there are eleven criteria that comprise the diasnosis of substance use disorder. Two are needed to make a diagnosis. The criteria are divided into four categories: (i) impaired control, (ii) social impairment, (iii) risky use, and (iv) pharmacological criteria. The diagnoses are further classified into mild (2-3 symptoms), moderate (4-5 symptoms), or severe (6-11 symptoms). The symptoms must have occurred during a twelve month period. Below you’ll find examples of each criteria for alcohol use disorder.

1. Using more substance than intended or using over a longer period of time than intended.

Example: Planning to have a glass of wine and then drinking the whole bottle.

2. Using substances in hazardous situations.

Example: drunk driving

3. Continued use despite interpersonal problems.

Example: arguing with spouse while drunk, arguing about drinking too much

4. Tolerance

Example: Needing six drinks to feel buzzed when it used to take three.

5. Withdrawal

Example: Getting tremors, or “the shakes” when abstaining from alcohol.

6. Continued use despite problems at work, school, or home.

Example: getting suspended from school for showing up drunk

7. Unsuccessful efforts to cut down on substance use 

Example: Decided not to drink this weekend, but by Friday night, purchased a case of beer

8. Lots of time spent obtaining, using, or recovering from the substance.

Example: Teenager spends the entire day on a Friday finding someone to buy alcohol for the weekend and then all day Monday in bed with a hangover.

9. Important activities given up due to substance use.

Example: Stopped going to the gym because of either being drunk or hungover most of the time.

10. Continued use despite physiological or psychological problems caused or worsened by the substance.

Example: Drinking despite having elevated liver function tests indicating liver damage.

11. Craving.

Example: The strong desire for a drink. If you haven’t had a craving before, it’s difficult to explain. It can occupy your entire brain and thoughts.

This has been a fairly dense post, but hopefully it clarifies how substance use disorders are diagnosed. In the future, this foundational knowledge will provide a framework for current event topics related to addictive disorders.

Addictive disorders are of particular interest to Shrinks in Sneakers! If there are any specific topics you would like to hear about, please reach out and we will work on something.

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