What is the difference between ACAMPROSATE CALCIUM and NALTREXONE HYDROCHLORIDE?

ACAMPROSATE CALCIUM and NALTREXONE HYDROCHLORIDE are both Substance Use Agents, so they work through the same broad mechanism. They differ in dosing, half-life, side-effect frequency, and how individual patients tolerate them. See the head-to-head sections below for the specifics.

Can ACAMPROSATE CALCIUM and NALTREXONE HYDROCHLORIDE be used for the same conditions?

Both medications are prescribed for overlapping indications including See full prescribing information. Always verify with your prescriber and the current FDA label before switching.

Is acamprosate calcium the same as Naltrexone Hydrochloride?

No. acamprosate calcium (ACAMPROSATE CALCIUM) and Naltrexone Hydrochloride (NALTREXONE HYDROCHLORIDE) are distinct medications. They are sometimes confused because of similar branding or because they treat overlapping conditions, but they have different active ingredients and different safety profiles.

Which has fewer side effects, ACAMPROSATE CALCIUM or NALTREXONE HYDROCHLORIDE?

Side-effect frequency varies by individual. The side-effect comparison section on this page shows FAERS-reported events for each drug side by side. FAERS is voluntary reporting, so it reflects what patients and clinicians chose to report, not absolute population risk.

Can I switch from ACAMPROSATE CALCIUM to NALTREXONE HYDROCHLORIDE?

Switching medications should always be done under prescriber supervision. The "patient stories" section on this page includes accounts from people who have made the switch and what their transition felt like, but those are individual experiences, not protocols.

ACAMPROSATE CALCIUM vs NALTREXONE HYDROCHLORIDE

Compare ACAMPROSATE CALCIUM (acamprosate calcium) and NALTREXONE HYDROCHLORIDE (Naltrexone Hydrochloride) — clinical data, side effects, and patient experiences.

ACAMPROSATE CALCIUM

acamprosate calcium, Campral · Substance Use Agent

How it works

12.1 Mechanism of Action The mechanism of action of acamprosate in maintenance of alcohol abstinence is not completely understood. Chronic alcohol exposure is hypothesized to alter...

Approved for

See full prescribing information

OralTablet

NALTREXONE HYDROCHLORIDE

Naltrexone Hydrochloride, Vivitrol, ReVia · Substance Use Agent

How it works

Other agent

Approved for

See full prescribing information

OralTablet

Quick Comparison

ACAMPROSATE CALCIUMNALTREXONE HYDROCHLORIDE

Drug Class

Substance Use Agent

Route

Oral

Half-Life

—

FDA Approved

—

Pregnancy

—

Side Effect Frequency Comparison

Estimated frequency (%) based on clinical trial data

Side Effects

ACAMPROSATE CALCIUM

Low Blood Pressure

1-10%

Weakness

1-10%

Condition Worsened

1-10%

Fatigue

1-10%

Headache

1-10%

Depression

1-10%

NALTREXONE HYDROCHLORIDE

Injection Site Reaction

>10%

Nausea

>10%

Injection Site Pain

1-10%

Headache

1-10%

Fatigue

1-10%

Dizziness

1-10%

Drug Not Working

1-10%

Vomiting

0.1-1%

FDA Warnings

ACAMPROSATE CALCIUM

5 WARNINGS AND PRECAUTIONS Dose reduction is required for patients with moderate renal impairment ( 5
Acamprosate calcium is contraindicated in patients with severe renal impairment (creatinine clearance of ≤30 mL/min) [ see Dosage and Administration (2

NALTREXONE HYDROCHLORIDE

WARNINGS Vulnerability to Opioid Overdose After opioid detoxification, patients are likely to have reduced tolerance to opioids
Cases of opioid overdose with fatal outcomes have been reported in patients after discontinuing treatment
It is important that patients inform family members, and the people closest to the patient of this increased sensitivity to opioids and the risk of overdose
This poses a potential risk to individuals who attempt, on their own, to overcome the blockade by administering large amounts of exogenous opioids

Community Sentiment Analysis

Based on 1 Reddit discussions

ACAMPROSATE CALCIUM

positive

0 threads

NALTREXONE HYDROCHLORIDE

100%

positive

1 threads

Community-Reported Side Effects

% of discussions mentioning each side effect

Community Discussions

No community discussions found for ACAMPROSATE CALCIUM yet.

Community Discussions

1 Reddit threads analysed for NALTREXONE HYDROCHLORIDE

Overall Sentiment

Positive

Comparison Threads

Avg Post Score

1,137 upvotes

Most discussed side effects in community

Dizziness (1)

Rash (1)

Anxiety (1)

Drowsiness (1)

Stomach Pain (1)

Vision Changes (1)

Patient Experiences (r/pharmacy, r/AskDocs & more)

I'd only been overseas on business for two weeks. When I got back, someone was in my home, painted to look like our cat,…

*“Hey! Get the* ***fuck*** *off my son!”* I barked, storming towards our couch, suitcase falling from my grasp somewhere along the way. Juli planted a firm hand on my chest as I tried to pass her, asking what *my* problem was. She insisted that I must be exhausted from the flight, that I wasn’t thin

r/nosleep1,137417mo ago

Dizziness

Rash

Anxiety

Community discussions are sourced from public Reddit threads. Content reflects individual opinions and is not medical advice.

ACAMPROSATE CALCIUM vs NALTREXONE HYDROCHLORIDE: What You Should Know

Key Differences

Both ACAMPROSATE CALCIUM and NALTREXONE HYDROCHLORIDE belong to the Substance Use Agent class. While they share a similar mechanism of action, differences in pharmacokinetics, dosing, and side effect profiles may make one more suitable than the other for individual patients.

Shared Indications

Both medications are approved for See full prescribing information. When two drugs treat the same condition, the choice between them often depends on the patient's medical history, other medications, tolerability, and prescriber preference.

Safety Considerations

ACAMPROSATE CALCIUM carries 2 FDA warnings. NALTREXONE HYDROCHLORIDE carries 4 FDA warnings. Patients should discuss all warnings and contraindications with their healthcare provider before starting or switching medications..

This comparison is for informational purposes only. Always consult a qualified healthcare professional before making medication decisions.

Related Comparisons

NALOXONE HYDROCHLORIDE vs NALTREXONE HYDROCHLORIDE→NALTREXONE HYDROCHLORIDE vs PENTAZOCINE HYDROCHLORIDE AND NALOXONE HYDROCHLORIDE→DISULFIRAM vs NALTREXONE HYDROCHLORIDE→NALOXONE HYDROCHLORIDE NASAL vs NALTREXONE HYDROCHLORIDE→NALOXONE HCL vs NALTREXONE HYDROCHLORIDE→ACAMPROSATE CALCIUM vs NALOXONE HYDROCHLORIDE→

Primary sources

Every figure on this comparison links back to its primary source. See data sources and methodology for the full provenance trail.

ACAMPROSATE CALCIUM: DailyMed label · FAERS adverse events · ClinicalTrials.gov
NALTREXONE HYDROCHLORIDE: DailyMed label · FAERS adverse events · ClinicalTrials.gov

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ACAMPROSATE CALCIUM vs NALTREXONE HYDROCHLORIDE

Compare ACAMPROSATE CALCIUM (acamprosate calcium) and NALTREXONE HYDROCHLORIDE (Naltrexone Hydrochloride) — clinical data, side effects, and patient experiences.

ACAMPROSATE CALCIUM

acamprosate calcium, Campral · Substance Use Agent

How it works

12.1 Mechanism of Action The mechanism of action of acamprosate in maintenance of alcohol abstinence is not completely understood. Chronic alcohol exposure is hypothesized to alter...

Approved for

See full prescribing information

OralTablet

NALTREXONE HYDROCHLORIDE

Naltrexone Hydrochloride, Vivitrol, ReVia · Substance Use Agent

How it works

Other agent

Approved for

See full prescribing information

OralTablet

Quick Comparison

ACAMPROSATE CALCIUMNALTREXONE HYDROCHLORIDE

Drug Class

Substance Use Agent

Route

Oral

Half-Life

—

FDA Approved

—

Pregnancy

—

Side Effect Frequency Comparison

Estimated frequency (%) based on clinical trial data

Side Effects

ACAMPROSATE CALCIUM

Low Blood Pressure

1-10%

Weakness

1-10%

Condition Worsened

1-10%

Fatigue

1-10%

Headache

1-10%

Depression

1-10%

NALTREXONE HYDROCHLORIDE

Injection Site Reaction

>10%

Nausea

>10%

Injection Site Pain

1-10%

Headache

1-10%

Fatigue

1-10%

Dizziness

1-10%

Drug Not Working

1-10%

Vomiting

0.1-1%

FDA Warnings

ACAMPROSATE CALCIUM

5 WARNINGS AND PRECAUTIONS Dose reduction is required for patients with moderate renal impairment ( 5
Acamprosate calcium is contraindicated in patients with severe renal impairment (creatinine clearance of ≤30 mL/min) [ see Dosage and Administration (2

NALTREXONE HYDROCHLORIDE

WARNINGS Vulnerability to Opioid Overdose After opioid detoxification, patients are likely to have reduced tolerance to opioids
Cases of opioid overdose with fatal outcomes have been reported in patients after discontinuing treatment
It is important that patients inform family members, and the people closest to the patient of this increased sensitivity to opioids and the risk of overdose
This poses a potential risk to individuals who attempt, on their own, to overcome the blockade by administering large amounts of exogenous opioids

Community Sentiment Analysis

Based on 1 Reddit discussions

ACAMPROSATE CALCIUM

positive

0 threads

NALTREXONE HYDROCHLORIDE

100%

positive

1 threads

Community-Reported Side Effects

% of discussions mentioning each side effect

Community Discussions

No community discussions found for ACAMPROSATE CALCIUM yet.

Community Discussions

1 Reddit threads analysed for NALTREXONE HYDROCHLORIDE

Overall Sentiment

Positive

Comparison Threads

Avg Post Score

1,137 upvotes

Most discussed side effects in community

Dizziness (1)

Rash (1)

Anxiety (1)

Drowsiness (1)

Stomach Pain (1)

Vision Changes (1)

Patient Experiences (r/pharmacy, r/AskDocs & more)

I'd only been overseas on business for two weeks. When I got back, someone was in my home, painted to look like our cat,…

r/nosleep1,137417mo ago

Dizziness

Rash

Anxiety

Community discussions are sourced from public Reddit threads. Content reflects individual opinions and is not medical advice.

ACAMPROSATE CALCIUM vs NALTREXONE HYDROCHLORIDE: What You Should Know

Key Differences

Shared Indications

Safety Considerations

This comparison is for informational purposes only. Always consult a qualified healthcare professional before making medication decisions.

Primary sources

Every figure on this comparison links back to its primary source. See data sources and methodology for the full provenance trail.

ACAMPROSATE CALCIUM: DailyMed label · FAERS adverse events · ClinicalTrials.gov
NALTREXONE HYDROCHLORIDE: DailyMed label · FAERS adverse events · ClinicalTrials.gov