Alcohol Use Disorder Pharmacotherapy: How Centrum Pharmacy Supports Complete, Compassionate Care

Alcohol use is common in Canada. In 2023, approximately 79% of Canadians reported consuming alcohol within the previous 12 months. While many individuals drink socially, high-risk alcohol use is associated with significant health, social, and economic consequences—including cancer, liver disease, cardiovascular disease, cognitive decline, impaired judgment, and injury.

Alcohol Use Disorder (AUD) is defined as a problematic pattern of alcohol use leading to clinically significant impairment or distress. Nearly 1 in 5 Canadians aged 15 or older meet diagnostic criteria at some point in their lifetime. This is not a rare condition—it is a chronic, relapsing medical disorder that deserves structured, evidence-based care.

At Centrum Pharmacy, we believe in Complete, Comprehensive, Caring, and Connected Care—the 4 C’s that guide our practice. Pharmacists play a critical role in identifying, supporting, and monitoring patients living with AUD.

Screening: Identifying Risk Early

Pharmacists are among the most accessible healthcare professionals in Canada. We can help identify potential alcohol misuse using validated screening tools such as:

The CAGE Screening Tool

1. Have you ever felt you ought to Cut down on your drinking?
2. Have people Annoyed you by criticizing your drinking?
3. Have you ever felt Guilty about your drinking?
4. Have you ever had an Eye-opener (a morning drink) to steady your nerves or relieve a hangover?

Two or more “yes” responses may suggest Alcohol Use Disorder and warrant further evaluation.

At Centrum Pharmacy, screening is handled respectfully and confidentially. When appropriate, we coordinate with physicians in our community to ensure patients receive ongoing primary care and specialist referral if needed.

Evidence-Based Pharmacotherapy for AUD

Pharmacotherapy for AUD remains underutilized despite strong evidence supporting its effectiveness. Treatment goals vary by patient:

• Complete abstinence
• Reduction in heavy drinking
• Decreased cravings
• Harm reduction

Medication selection must align with the patient’s goals, medical history, comorbidities, and lifestyle.

First-Line Treatments

1. Naltrexone

Mechanism:
Naltrexone is a mu-opioid receptor antagonist that reduces the rewarding effects of alcohol.

Clinical benefits:

• Reduces heavy drinking days
• Decreases cravings
• Supports abstinence (NNT ≈ 20)
• Once-daily dosing (typically 50 mg daily)

Important considerations:

• Contraindicated in patients using opioids
• Avoid in acute or severe hepatic dysfunction
• Monitor liver function regularly
• Gastrointestinal side effects are most common

Some patients may use “as needed” dosing (often referred to as the Sinclair method), where naltrexone is taken prior to anticipated drinking episodes—particularly useful in binge-drinking patterns. This strategy should be guided carefully by an experienced clinician.

2. Acamprosate

Mechanism:
Believed to modulate glutamate and GABA pathways to stabilize neurochemical changes associated with alcohol dependence.

Clinical benefits:

• Stronger evidence for maintaining abstinence (NNT ≈ 12)
• Well tolerated
• Minimal hepatic concerns

Limitations:

• Three-times-daily dosing (666 mg TID)
• Requires renal dose adjustment
• Contraindicated in severe renal impairment

Naltrexone or Acamprosate?

There is no definitive evidence that one is universally superior. Decision-making depends on:

• Patient preference
• Goal (abstinence vs. reduction)
• Liver function
• Renal function
• Dosing convenience
• Concurrent medications

Combination therapy may be used in refractory cases under specialist supervision.

Importantly, unlike disulfiram, neither naltrexone nor acamprosate causes an aversive reaction if alcohol is consumed. Patients should continue therapy even after relapse—these medications support ongoing recovery and reduced drinking over time.

Second-Line and Off-Label Options

When first-line agents are ineffective or contraindicated, other options may be considered.

Disulfiram

Historically used to create an aversive reaction to alcohol. However:

• Risk of severe physiologic reaction
• Hepatotoxicity monitoring required
• Not commercially available in Canada (requires compounding)
• Limited coverage
• Low adherence

Use is now uncommon in routine practice.

Gabapentin (Off-Label)

• May reduce withdrawal symptoms and heavy drinking
• Requires renal adjustment
• TID dosing
• Risk of sedation and dizziness
• Monitor for respiratory depression when combined with CNS depressants

May be helpful in patients with neuropathic pain or insomnia.

Topiramate (Off-Label)

• Evidence for reducing heavy drinking
• Twice-daily dosing
• Side effects: paresthesia, sedation, weight loss
• Teratogenic—use caution in childbearing potential

May be considered in polysubstance use.

The Role of Centrum Pharmacy: Beyond Dispensing

At Centrum Pharmacy, our model is not transactional dispensing—it is integrated, physician-connected care.

We work closely with physicians in our community to:

• Screen and identify AUD
• Initiate appropriate pharmacotherapy when within scope
• Adjust therapy safely
• Provide structured medication counselling
• Support relapse prevention
• Ensure patients are rostered with a family physician whenever possible

Through our physician recruitment efforts and strong community partnerships, we help close gaps in addiction medicine access—particularly important in a strained healthcare system.

Why Pharmacist-Led AUD Care Matters

Alcohol Use Disorder is a chronic medical condition. Like hypertension or diabetes, it requires:

• Ongoing monitoring
• Medication optimization
• Adherence support
• Risk mitigation
• Collaborative care

Pharmacists are uniquely positioned to provide consistent, accessible follow-up between physician visits. This is Complete, Comprehensive, Caring, Connected Care in action.

If you or someone you know is struggling with alcohol use, speak confidentially with our team at Centrum Pharmacy. Evidence-based treatment is available—and recovery is possible.

Disclaimer: The medical information on this site is provided as an information resource only and is not to be used or relied on for any diagnostic or treatment purposes. This information does not substitute for professional diagnosis and treatment. Please do not initiate, modify, or discontinue any treatment, medication, or supplement solely based on this information. Always seek the advice of your healthcare provider first. Full Disclaimer.