Medications for Treating Alcohol Dependence



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Am Fam Physician. 2005 Nov 1;72(9):1775-1780.

Medications for treating alcohol dependence primarily have been adjunctive interventions, and only three medications—disulfiram, naltrexone, and acamprosate—are approved for this indication by the U.S. Food and Drug Administration. Disulfiram, an aversive agent that has been used for more than 40 years, has significant adverse effects and compliance difficulties with no clear evidence that it increases abstinence rates, decreases relapse rates, or reduces cravings. In contrast, naltrexone, an anticraving agent, reduces relapse rates and cravings and increases abstinence rates. Acamprosate also reduces relapse rates and increases abstinence rates. Serotonergic and anticonvulsant agents promise to play more of a role in the treatment of alcohol dependence. Although not approved by the U.S. Food and Drug Administration for this indication, the anticonvulsant topiramate and several serotonergic agents (e.g., fluoxetine, ondansetron) have been shown in recent studies to increase abstinence rates and decrease drinking.

Almost one third of Americans consume enough alcohol to be considered at risk for alcohol dependence, and alcohol abuse and dependence are associated with more than 100,000 deaths from alcohol-related diseases and injuries each year. The economic cost of alcohol abuse and dependence was estimated at more than $184 billion for 1998.1 Use of screening tools and brief primary care interventions for alcohol problems significantly reduces drinking levels in “problem drinkers” who are not yet alcohol dependent.2 Counseling and 12-step structured treatment programs have been the mainstays of alcohol dependence treatment, whereas pharmacologic treatments traditionally have played an adjunctive role.

SORT: KEY RECOMMENDATIONS FOR PRACTICE

Clinical recommendationEvidence ratingReferences

Naltrexone (Trexan) and acamprosate (Campral) are recommended as FDA-approved options for treatment of alcohol dependence in conjunction with behavior therapy.

A

5

Disulfiram (Antabuse) does not increase abstinence rates or decrease relapse rates or cravings compared with placebo, and it is not recommended for routine use in primary care.

B

6

Fluoxetine (Prozac) and other SSRIs are recommended for patients with comorbid depressive disorders.

B

13,14

Topiramate (Topamax) and ondansetron (Zofran) are recommendedto reduce drinking frequency and increase abstinence.

B

3,4


FDA = U.S. Food and Drug Administration; SSRI = selective serotonin reuptake inhibitor.

A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series. For information about the SORT evidence rating system, see page 1639 or http://www.aafp.org/afpsort.xml.

SORT: KEY RECOMMENDATIONS FOR PRACTICE

View Table

SORT: KEY RECOMMENDATIONS FOR PRACTICE

Clinical recommendationEvidence ratingReferences

Naltrexone (Trexan) and acamprosate (Campral) are recommended as FDA-approved options for treatment of alcohol dependence in conjunction with behavior therapy.

A

5

Disulfiram (Antabuse) does not increase abstinence rates or decrease relapse rates or cravings compared with placebo, and it is not recommended for routine use in primary care.

B

6

Fluoxetine (Prozac) and other SSRIs are recommended for patients with comorbid depressive disorders.

B

13,14

Topiramate (Topamax) and ondansetron (Zofran) are recommendedto reduce drinking frequency and increase abstinence.

B

3,4


FDA = U.S. Food and Drug Administration; SSRI = selective serotonin reuptake inhibitor.

A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series. For information about the SORT evidence rating system, see page 1639 or http://www.aafp.org/afpsort.xml.

To date, three medications—disulfiram (Antabuse), naltrexone (Trexan), and acamprosate (Campral)—have been approved by the U.S. Food and Drug Administration (FDA) for the treatment of alcohol dependence, and only about 20 percent of eligible patients receive them. In the past decade, however, there has been a growing body of evidence supporting a more central role for medications in the treatment of alcohol dependence. These medications, the evidence supporting them, and recommended dosages are discussed in the following. Table 13,4 provides a summary of the medications with prescribing information, adverse effects, contraindications, and costs.

TABLE 1

Medications for Treatment of Alcohol Dependence

MedicationFDA approved?DosageSide effectsContraindications*CommentsCost

Acamprosate (Campral)

Yes

333-mg enteric coated tablets Adults ≥ 132 lbs (60 kg): two tablets three times per day

Diarrhea, headache, flatulence, nausea, vomiting, dyspepsia

Severe renal impairment (creatinine clearance < 30 mL per minute [0.5 mL per second])

To avoid adverse gastrointestinal effects, initial dosing usually is at one half the given dosages with an increase of one tablet to the daily dosage each week.

$125

Adults < 132 lbs: two tablets with the morning meal, one with the midday meal, and one with the evening meal

Disulfiram (Antabuse)

Yes

Begin with 250 mg once per day; increase to 500 mg once per day.

Disulfiram–alcohol interaction: palpitations, flushing, nausea, vomiting, headache

Alcohol, metronidazole (Flagyl), or paraldehyde use psychosis; cardiovascular disease

Initiate only after patient has abstained from alcohol for at least 12 hours.

42

Not generally recommended for treating alcohol dependence in the primary care setting

Patient should carry an identification card describing the disulfiram–alcohol interaction.

Monitor liver function tests for hepatotoxicity.

Fluoxetine (Prozac)

No

Begin with 20 mg per day; may increase to 60 mg per day as needed.

Nausea, headache, sedation, anxiety, sexual dysfunction

Use of an MAOI, mesoridazine (Serentil), or thioridazine (Mellaril)

Recommended only in patients with comorbid depression

127 (79 to 89 generic)

Nalmefene (Revex)

No

Available only in an injectable form (outside of research) to treat opiate overdose.

Nausea, tachycardia, vasodilation, dizziness, headache, chills, vomiting

None

62 (for 2 mL [2 mg])

Naltrexone (Trexan)

Yes

50 mg once per day

Nausea, headache, anxiety, sedation

Narcotic use, acute opioid withdrawal, acute hepatitis, liver failure

Monitor liver function tests for hepatotoxicity.

205 (128 to 137 generic)

Ondansetron (Zofran)

No

4 mcg per kg twice per day

Malaise, fatigue, headache, dizziness, anxiety

None

661 (for 4 mg daily)

Topiramate (Topamax)

No

Begin with 25 mg morning dose and increase to a total of 300 mg given twice a day in divided doses.

Recent FDA warning of metabolic acidosis, especially with renal or liver disease

None

Consider interactions withother anticonvulsant drugs.

53

Dizziness, somnolence, ataxia, impaired concentration, confusion, fatigue, paresthesias, speech difficulties, diplopia, nausea


FDA = U.S. Food and Drug Administration; MAOI = monoamine oxidase inhibitor.

*—Other than hypersensitivity to the drug, which is a contraindication for all medications listed.

†—Estimated cost to the pharmacist based on average wholesale prices (rounded to the nearest dollar) in Red Book. Montvale, N.J.: Medical Economics Data, 2005. Cost to the patient will be higher, depending on prescription filling fee.

Information from references 3 and 4.

TABLE 1   Medications for Treatment of Alcohol Dependence

View Table

TABLE 1

Medications for Treatment of Alcohol Dependence

MedicationFDA approved?DosageSide effectsContraindications*CommentsCost

Acamprosate (Campral)

Yes

333-mg enteric coated tablets Adults ≥ 132 lbs (60 kg): two tablets three times per day

Diarrhea, headache, flatulence, nausea, vomiting, dyspepsia

Severe renal impairment (creatinine clearance < 30 mL per minute [0.5 mL per second])

To avoid adverse gastrointestinal effects, initial dosing usually is at one half the given dosages with an increase of one tablet to the daily dosage each week.

$125

Adults < 132 lbs: two tablets with the morning meal, one with the midday meal, and one with the evening meal

Disulfiram (Antabuse)

Yes

Begin with 250 mg once per day; increase to 500 mg once per day.

Disulfiram–alcohol interaction: palpitations, flushing, nausea, vomiting, headache

Alcohol, metronidazole (Flagyl), or paraldehyde use psychosis; cardiovascular disease

Initiate only after patient has abstained from alcohol for at least 12 hours.

42

Not generally recommended for treating alcohol dependence in the primary care setting

Patient should carry an identification card describing the disulfiram–alcohol interaction.

Monitor liver function tests for hepatotoxicity.

Fluoxetine (Prozac)

No

Begin with 20 mg per day; may increase to 60 mg per day as needed.

Nausea, headache, sedation, anxiety, sexual dysfunction

Use of an MAOI, mesoridazine (Serentil), or thioridazine (Mellaril)

Recommended only in patients with comorbid depression

127 (79 to 89 generic)

Nalmefene (Revex)

No

Available only in an injectable form (outside of research) to treat opiate overdose.

Nausea, tachycardia, vasodilation, dizziness, headache, chills, vomiting

None

62 (for 2 mL [2 mg])

Naltrexone (Trexan)

Yes

50 mg once per day

Nausea, headache, anxiety, sedation

Narcotic use, acute opioid withdrawal, acute hepatitis, liver failure

Monitor liver function tests for hepatotoxicity.

205 (128 to 137 generic)

Ondansetron (Zofran)

No

4 mcg per kg twice per day

Malaise, fatigue, headache, dizziness, anxiety

None

661 (for 4 mg daily)

Topiramate (Topamax)

No

Begin with 25 mg morning dose and increase to a total of 300 mg given twice a day in divided doses.

Recent FDA warning of metabolic acidosis, especially with renal or liver disease

None

Consider interactions withother anticonvulsant drugs.

53

Dizziness, somnolence, ataxia, impaired concentration, confusion, fatigue, paresthesias, speech difficulties, diplopia, nausea


FDA = U.S. Food and Drug Administration; MAOI = monoamine oxidase inhibitor.

*—Other than hypersensitivity to the drug, which is a contraindication for all medications listed.

†—Estimated cost to the pharmacist based on average wholesale prices (rounded to the nearest dollar) in Red Book. Montvale, N.J.: Medical Economics Data, 2005. Cost to the patient will be higher, depending on prescription filling fee.

Information from references 3 and 4.

Naltrexone

Naltrexone is an opioidreceptor antagonist approved for use in the treatment of alcohol dependence in conjunction with psychosocial interventions. It is believed that naltrexone works through its blockage of μopioid receptors, which reduces the reinforcing effects of alcohol leading to decreased feelings of intoxication and fewer cravings.

In a systematic review5 of 11 double-blind, placebo-controlled trials, researchers found that naltrexone reduces short-term relapse rates in patients with alcohol dependence when combined with psychosocial treatments. Short-term outcomes in favor of naltrexone included fewer patients relapsing to alcohol dependence (38 versus 60 percent with placebo), fewer patients returning to drinking (61 versus 69 percent), reduced cravings for alcohol, and fewer drinking days.5 The data showed one relapse was prevented for every five patients treated with naltrexone (i.e., number needed to treat [NNT] = 5).

More recent randomized controlled trials (RCTs) looking at longer-term outcomes report mixed results. In a systematic review6 of three studies assessing medium-term outcomes (six to 12 months), researchers found no difference between naltrexone and placebo groups. In addition, a large trial7 comparing outcomes of three therapy groups—12 months of naltrexone therapy, three months of naltrexone followed by nine months of placebo, and 12 months of placebo—found no significant differences among the groups in the number of days to relapse, number of drinking days, or number of drinks per drinking day. Although there is good evidence supporting short-term benefit with naltrexone, the evidence for longer-term use is less compelling.

The recommended dosage of naltrexone is 50 mg per day in a single dose. Long-term opioid therapy for chronic pain or heroin dependence is a contraindication for naltrexone because the drug could precipitate severe withdrawal syndrome. Naltrexone has been shown to have dose-related hepatotoxicity, although generally this occurs at doses higher than those recommended for treatment of alcohol dependence. The drug also is contraindicated in patients with hepatitis or liver failure, and all patients should have hepatic transaminase levels checked monthly for the first three months and every three months thereafter.8

Naltrexone generally is well tolerated; nausea is the most common adverse effect (reported by 10 percent of patients), followed by headache, anxiety, and sedation.9 Naltrexone is FDA pregnancy category C. Good compliance is considered essential for successful treatment.

Disulfiram

Disulfiram inhibits acetaldehyde dehydrogenase. Although it has been used to treat alcohol dependence for more than 40 years, the evidence for its effectiveness is weak. An evidence report from the Agency for Health-care Research and Quality6 concluded that studies using the disulfiram implant display serious methodologic weaknesses (most substantively, regarding the question of bioavailability), and that the four placebo-controlled RCTs using oral disulfiram produced mixed results. Although in two trials oral disulfiram was shown to reduce frequency of drinking days, it did not improve relapse rates compared with placebo. Two studies noted patient compliance with oral disulfiram and showed it to be low, and a third study had a 46 percent dropout rate. These methodologic limitations and mixed results make it difficult to state clearly how many patients benefit from disulfiram.

Disulfiram usually is given in a dosage of 250 mg per day with a maximum dosage of 500 mg per day. Consuming alcohol after taking disulfiram results in symptoms such as palpitations, flushing, nausea, vomiting, and headache. More severe reactions could include myocardial infarction, congestive heart failure, respiratory depression, and death. Because of the potential for a severe alcohol–disulfiram interaction, disulfiram is contraindicated in patients who are receiving or have recently received metronidazole or ingested alcohol, have psychosis, or have cardiovascular disease, and is not recommended for patients with severe pulmonary disease, chronic renal failure, or diabetes, or those older than 60 years. It also is not recommended in patients with peripheral neuropathy, seizures, or cirrhosis with portal hypertension. Hepatotoxicity is a rare but potentially fatal adverse effect.8 Some experts recommend that baseline liver function tests should be obtained, with repeat testing at two weeks, three months, six months, and then every six months thereafter. Because of these significant restrictions and problems with compliance, disulfiram is not recommended for treating alcohol dependence, particularly in the primary care setting.6 Disulfiram is FDA pregnancy category C.

Acamprosate

Acamprosate (calcium homotaurinate) is believed to block glutaminergicN-methyl-Daspartate receptors and activate 3-aminobutyric acid type A receptors, and was recently approved by the FDA for the treatment of alcohol dependence. A systematic review10 of 15 studies showed that acamprosate reduces short-term and long-term (more than six months) relapse rates in patients with alcohol dependence when combined with psychosocial treatments. Outcomes in favor of acamprosate included fewer patients returning to drinking (68 versus 80 percent, NNT = 8) and higher percentage of days of total abstinence (54 versus 38 percent, NNT = 7).10

Acamprosate is available in 333-mg enteric, coated tablets; dosing is by weight (Table 13,4). It is well tolerated with limited side effects, most commonly transient diarrhea (occurring in approximately 10 percent of patients). There are no interactions with concomitant use of alcohol, diazepam (Valium), disulfiram, or imipramine (Tofranil), so patients with alcohol dependence can continue to use acamprosate during a relapse. Patients with renal insufficiency or advanced cirrhosis should not take acamprosate, but it may be taken safely by patients with liver dysfunction.11 Like naltrexone and disulfiram, acamprosate is FDA pregnancy category C (adverse effects on the fetus in animal studies but no human trials).

Serotonergic Agents

Research into the use of selective serotonin reuptake inhibitors (SSRIs) to treat patients with alcohol dependence has been under way for the past decade; however, most of this work has used small samples and inconsistent outcome measures. One clinical trial12 of 101 patients showed that fluoxetine (Prozac) at a dosage of up to 60 mg per day had no significant effect on alcohol consumption in persons who were alcohol dependent without major depression. In a study13 involving psychiatric patients with major depression and alcohol dependence, those treated with 20 to 40 mg per day of fluoxetine over 12 weeks had fewer drinks, fewer drinking days, and fewer heavy drinking days than those receiving placebo. Other SSRIs have shown similar results.14 Studies on the effect of SSRIs in patients with more severe alcohol dependence (Type B according to the classification system by Babor and colleagues15) show no clear benefit and sometimes show trends toward worse outcomes with SSRIs,16 and studies involving patients with less severe alcohol dependence (Babor Type A15) show no consistent benefit.17

The use of selective serotonin antagonists for early-onset alcohol dependence also has been investigated, with positive results. In one RCT,3 ondansetron (Zofran) was shown to significantly reduce self-reported drinking. Patients who received ondansetron 4 mcg per kg twice per day had fewer drinks per day. They also had a greater percentage of days of abstinence (70 versus 50 percent with placebo) and a greater total number of days abstinent per study week (6.7 versus 5.9 with placebo) in patients with early-onset alcoholism. All patients also received weekly group cognitive behavior therapy.

Serotonergic agents generally are well tolerated.18 Nausea, headache, sedation, and sexual dysfunction are among the most commonly reported adverse effects. The most significant drug interactions for SSRIs are with monoamine oxidase inhibitors, warfarin (Coumadin), some antipsychotics, tetracyclic antidepressants, some benzodiazepines, St. John’s wort, and phenytoin (Dilantin).18

Anticonvulsants

Recent research suggests a role for anticonvulsants in the treatment of alcohol dependence beyond their use in withdrawal syndromes.4 Topiramate (Topamax) inhibits mesocorticolimbic dopamine release, which is believed to be associated with craving for alcohol. It is the best-studied drug in this class, although gabapentin (Neurontin)19 and valproate (Depacon)20 have shown some promise in case studies and small trials.

In a 12-week double-blind RCT4 of actively drinking patients with alcohol dependence, topiramate was more effective than placebo in initiating abstinence (26 percent more abstinent days with topiramate) and in reducing self-reported drinks per day, drinks per drinking day, and heavy drinking days. Compared with placebo, it also significantly reduced craving as measured on an obsessive-compulsive–drinking scale. These findings occurred in patients with early-onset and late-onset alcoholism.

The study4 used an escalating dose of 25 to 300 mg of topiramate per day. Hypersensitivity to the drug is the only known contraindication. Adverse effects include dizziness and somnolence (which are not dose related), ataxia, impaired concentration, confusion, fatigue, paresthesias, speech difficulties, diplopia, and nausea. Interactions exist between topiramate and other anticonvulsants, including phenytoin, valproic acid (Depakene), and carbamazepine (Tegretol).

Nalmefene

Nalmefene (Revex), another opioid antagonist, is similar to naltrexone but without FDA approval for treatment of alcohol dependence. Nalmefene at dosages of 20 or 80 mg orally per day has been shown in one RCT21to significantly reduce relapse to heavy drinking in outpatients with alcohol dependence. Patients receiving nalmefene had a 37 percent relapse rate compared with 59 percent in the placebo group (NNT = 5). However, treatment groups did not differ significantly in the percentage of days abstinent, in the mean number of drinks consumed in a drinking day, or in self-reported craving ratings. This 12-week study21 also provided weekly cognitive behavior therapy to all groups. Outside of research, nalmefene is available only in an injectable form.

Final Comments

The best choices for prevention of relapse are acamprosate and naltrexone with concurrent counseling through professional or self-help programs. Family physicians also may consider the use of an SSRI in the presence of a comorbid mood disorder. Evidence is lacking for combination pharmacotherapy, but research is under way. Topiramate and ondansetron show promise as treatments to increase abstinence. Because of its lack of effectiveness and problems with adverse effects and compliance, disulfiram is not recommended in the primary care setting.

NOTE: Studies for this article were identified through a systematic search of the Cochrane and ETOH databases and PubMed for articles published from 1996 to 2003 using the subject headings alcoholism and drug therapy and the drug names. The review also included bibliographies of the identified articles.

The Author

STEVEN H. WILLIAMS, PH.D., is former director of behavioral medicine at the Harrisburg (Pa.) Family Practice Residency Program and currently is a clinical psychologist with the Psychology Service at the Veterans Affairs Medical Center in Lebanon, Pa. Dr. Williams received a doctoral degree in counseling psychology from the University of Florida, Gainesville, and a postdoctoral certification in psychopharmacology from Fairleigh Dickinson University, Teaneck, N.J.

Address correspondence to Steven H. Williams, Ph.D., VA Medical Center, 1700 S. Lincoln Ave., Lebanon, PA 17042. Reprints are not available from the author.

Author disclosure: nothing to disclose.

 

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3. Johnson BA, Roache JD, Javors MA, DiClemente CC, Cloninger CR, Prihoda TJ, et al. Ondansetron for reduction of drinking among biologically predisposed alcoholic patients: a randomized controlled trial. JAMA. 2000;284:963–71.

4. Johnson BA, Ait-Daoud N, Bowden CL, DiClemente CC, Roache JD, Lawson K, et al. Oral topiramate for treatment of alcohol dependence: a randomised controlled trial. Lancet. 2003;361:1677–85.

5. Srisurapanont M, Jarusuraisin N. Opioid antagonists for alcohol dependence. Cochrane Database Syst Rev. ;(1):CD001867.

6. West SL, Garbutt JC, Carey TS, Lux LJ, Jackman AM, Tolleson-Rinehart S, et al Pharmacotherapy for alcohol dependence. Rockville, Md.: U.S. Department of Health and Human Services; Public Health Service; Agency for Health Care Policy and Research, 1999.

7. Krystal JH, Cramer JA, Krol WF, Kirk GF, Rosenheck RA. Naltrexone in the treatment of alcohol dependence. N Engl J Med. 2001;345:1734–9.

8. Doering PL. Substance-related disorders: alcohol, nicotine, and caffeine. In: DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells BG, Posey LM, eds. Pharmacotherapy: a pathophysiologic approach. 4th ed. Stamford, Conn.: Appleton & Lange, 1999.

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11. Graham R, Wodak AD, Whelan G. New pharmacotherapies for alcohol dependence. MJA. 2002;177:103–7.

12. Kranzler HR, Burleson JA, Korner P, Del Boca FK, Bohn MJ, Brown J, et al. Placebo-controlled trial of fluoxetine as an adjunct to relapse prevention in alcoholics. Am J Psychiatry. 1995;152:391–7.

13. Cornelius JR, Salloum IM, Ehler JG, Jarrett PJ, Cornelius MD, Perel JM, et al. Fluoxetine in depressed alcoholics: a double-blind, placebo-controlled trial. Arch Gen Psychiatry. 1997;54:700–5.

14. Naranjo CA, Knoke DM. The role of selective serotonin reuptake inhibitors in reducing alcohol consumption. J Clin Psychiatry. 2001;62(suppl 20):18–25.

15. Babor TF, Dolinsky ZS, Meyer RE, Hesselbrock M, Hofmann M, Tennen H. Types of alcoholics: concurrent and predictive validity of some common classification schemes. Br J Addict. 1992;87:1415–31.

16. Kranzler HR, Burleson JA, Brown J, Babor TF. Fluoxetine treatment seems to reduce the beneficial effects of cognitive-behavioral therapy in type B alcoholics. Alcohol Clin Exp Res. 1996;20:1534–41.

17. Pettinati HM, Volpicelli JR, Kranzler HR, Luck G, Rukstalis MR, Cnaan A. Sertraline treatment for alcohol dependence: interactive effects of medication and subtype. Alcohol Clin Exp Res. 2000;24:1041–9.

18. Bezchlibnyk-Butler KZ, Jeffries JJ, Martin BA. Clinical handbook of psychotropic drugs. 10th ed. Seattle: Hogrefe & Huber, 2000.

19. Chatterjee CR, Ringold AL. A case report of reduction in alcohol craving and protection against alcohol withdrawal by gabapentin. J Clin Psychiatry. 1999;60:617.

20. Brady KT, Myrick H, Henderson S, Coffey SF. The use of divalproex in alcohol relapse prevention: a pilot study. Drug Alcohol Depend. 2002;67:323–30.

21. Mason BJ, Salvato FR, Williams LD, Ritvo EC, Cutler RB. A double-blind, placebo-controlled study of oral nalmefene for alcohol dependence. Arch Gen Psychiatry. 1999;56:719–24.

This article is one in a series coordinated by Allen F. Shaughnessy, Pharm.D., Tufts University Family Medicine Residency, Malden, Me.


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