What is the difference between ACAMPROSATE CALCIUM and NALOXONE HYDROCHLORIDE?

ACAMPROSATE CALCIUM and NALOXONE 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 NALOXONE 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 NALOXONE HYDROCHLORIDE?

No. acamprosate calcium (ACAMPROSATE CALCIUM) and NALOXONE HYDROCHLORIDE (NALOXONE 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 NALOXONE 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 NALOXONE 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 NALOXONE HYDROCHLORIDE

Compare ACAMPROSATE CALCIUM (acamprosate calcium) and NALOXONE HYDROCHLORIDE (NALOXONE 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

NALOXONE HYDROCHLORIDE

NALOXONE HYDROCHLORIDE, Narcan, Evzio · Substance Use Agent

How it works

12.1 Mechanism of Action Naloxone hydrochloride is an opioid antagonist that antagonizes opioid effects by competing for the same receptor sites. Naloxone hydrochloride reverses th...

Approved for

1 INDICATIONS AND USAGE Naloxone HCl Nasal Spray is indicated for the emergency treatment of known or suspected opioid overdose

NasalTablet

Quick Comparison

ACAMPROSATE CALCIUMNALOXONE HYDROCHLORIDE

Drug Class

Substance Use Agent

Route

Oral

Nasal

Half-Life

—

FDA Approved

—

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%

NALOXONE HYDROCHLORIDE

Nausea

1-10%

Vomiting

1-10%

Anxiety

1-10%

Headache

0.1-1%

Drug Not Working

0.1-1%

Fatigue

0.1-1%

Insomnia

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

NALOXONE HYDROCHLORIDE

5 WARNINGS AND PRECAUTIONS • Risk of Recurrent Respiratory and CNS Depression: Due to the duration of action of naloxone relative to the opioid, keep patient under continued surveillance and administer repeat doses of naloxone using a new nasal spray with each dose, as necessary, while awaiting emergency medical assistance
1 ) • Risk of Limited Efficacy with Partial Agonists or Mixed Agonists/Antagonists: Reversal of respiratory depression caused by partial agonists or mixed agonists/antagonists, such as buprenorphine and pentazocine, may be incomplete
3 ) • Risk of Cardiovascular (CV) Effects: Abrupt postoperative reversal of opioid depression may result in adverse CV effects
1 Risk of Recurrent Respiratory and Central Nervous System Depression The duration of action of most opioids may exceed that of Naloxone HCl Nasal Spray resulting in a return of respiratory and/or central nervous system depression after an initial improvement in symptoms

Clinical Trial Data

No head-to-head clinical studies found for ACAMPROSATE CALCIUM vs NALOXONE HYDROCHLORIDE.

ACAMPROSATE CALCIUM vs NALOXONE HYDROCHLORIDE: What You Should Know

Key Differences

Both ACAMPROSATE CALCIUM and NALOXONE 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. ACAMPROSATE CALCIUM is administered via Oral, whereas NALOXONE HYDROCHLORIDE uses Nasal. Route of administration can affect onset of action and patient adherence.

Safety Considerations

ACAMPROSATE CALCIUM carries 2 FDA warnings. NALOXONE 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→ACAMPROSATE CALCIUM vs NALTREXONE HYDROCHLORIDE→NALOXONE HYDROCHLORIDE vs PENTAZOCINE HYDROCHLORIDE AND NALOXONE HYDROCHLORIDE→DISULFIRAM vs NALOXONE HYDROCHLORIDE→NALOXONE HYDROCHLORIDE vs NALOXONE HYDROCHLORIDE NASAL→NALOXONE HCL 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
NALOXONE HYDROCHLORIDE: DailyMed label · FAERS adverse events · ClinicalTrials.gov

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ACAMPROSATE CALCIUM vs NALOXONE HYDROCHLORIDE

Compare ACAMPROSATE CALCIUM (acamprosate calcium) and NALOXONE HYDROCHLORIDE (NALOXONE 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

NALOXONE HYDROCHLORIDE

NALOXONE HYDROCHLORIDE, Narcan, Evzio · Substance Use Agent

How it works

12.1 Mechanism of Action Naloxone hydrochloride is an opioid antagonist that antagonizes opioid effects by competing for the same receptor sites. Naloxone hydrochloride reverses th...

Approved for

1 INDICATIONS AND USAGE Naloxone HCl Nasal Spray is indicated for the emergency treatment of known or suspected opioid overdose

NasalTablet

Quick Comparison

ACAMPROSATE CALCIUMNALOXONE HYDROCHLORIDE

Drug Class

Substance Use Agent

Route

Oral

Nasal

Half-Life

—

FDA Approved

—

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%

NALOXONE HYDROCHLORIDE

Nausea

1-10%

Vomiting

1-10%

Anxiety

1-10%

Headache

0.1-1%

Drug Not Working

0.1-1%

Fatigue

0.1-1%

Insomnia

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

NALOXONE HYDROCHLORIDE

5 WARNINGS AND PRECAUTIONS • Risk of Recurrent Respiratory and CNS Depression: Due to the duration of action of naloxone relative to the opioid, keep patient under continued surveillance and administer repeat doses of naloxone using a new nasal spray with each dose, as necessary, while awaiting emergency medical assistance
1 ) • Risk of Limited Efficacy with Partial Agonists or Mixed Agonists/Antagonists: Reversal of respiratory depression caused by partial agonists or mixed agonists/antagonists, such as buprenorphine and pentazocine, may be incomplete
3 ) • Risk of Cardiovascular (CV) Effects: Abrupt postoperative reversal of opioid depression may result in adverse CV effects
1 Risk of Recurrent Respiratory and Central Nervous System Depression The duration of action of most opioids may exceed that of Naloxone HCl Nasal Spray resulting in a return of respiratory and/or central nervous system depression after an initial improvement in symptoms

Clinical Trial Data

No head-to-head clinical studies found for ACAMPROSATE CALCIUM vs NALOXONE HYDROCHLORIDE.

ACAMPROSATE CALCIUM vs NALOXONE HYDROCHLORIDE: What You Should Know

Key Differences

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
NALOXONE HYDROCHLORIDE: DailyMed label · FAERS adverse events · ClinicalTrials.gov