Skip to main content

Acid Controller Complete Dual Action Side Effects

Generic name: calcium carbonate / famotidine / magnesium hydroxide

Medically reviewed by Last updated on Mar 17, 2024.

Note: This document contains side effect information about calcium carbonate / famotidine / magnesium hydroxide. Some dosage forms listed on this page may not apply to the brand name Acid Controller Complete Dual Action.

Applies to calcium carbonate / famotidine / magnesium hydroxide: oral tablet chewable.

Serious side effects

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

Other side effects

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at

For Healthcare Professionals

Applies to calcium carbonate/famotidine/magnesium hydroxide: oral tablet chewable.


Uncommon (0.1% to 1%): Abdominal discomfort, abdominal pain, diarrhea, dry mouth, flatulence, nausea, vomiting

Rare (less than 0.1%): Abdominal pain upper, constipation

Frequency not reported: Abdominal distension, abnormal feces, dyspepsia, eructation[Ref]

Nervous system

Uncommon (0.1% to 1%): Dizziness, dysgeusia

Rare (less than 0.1%): Somnolence

Frequency not reported: Paresthesia[Ref]


Uncommon (0.1% to 1%): Asthenia, fatigue

Rare (less than 0.1%): Malaise[Ref]


Uncommon (0.1% to 1%): Oropharyngeal discomfort, oropharyngeal pain[Ref]


Uncommon (0.1% to 1%): Rash

Rare (0.01% to 0.1%): Pruritus, urticaria

Very rare (less than 0.01%): Alopecia[Ref]


Rare (less than 0.1%): Anaphylactic reaction, angioedema, hypersensitivity[Ref]


Rare (less than 0.1%): Cholestatic jaundice, hepatic enzyme abnormal, liver disorder[Ref]


Rare (less than 0.1%): Leukopenia, pancytopenia[Ref]


Rare (less than 0.1%): Decreased appetite

Frequency not reported: Thirst[Ref]


Rare (less than 0.1%): Arthralgia[Ref]


Frequency not reported: Nervousness[Ref]


Rare (less than 0.1%): Gynecomastia[Ref]

More about Acid Controller Complete Dual Action (calcium carbonate / famotidine / magnesium hydroxide)

Patient resources

Other brands

Pepcid Complete, Dual Action Complete, Duo Fusion

Professional resources

Other brands

Pepcid Complete, Dual Action Complete

Related treatment guides


1. Cerner Multum, Inc. "UK Summary of Product Characteristics."

2. (2022) "Product Information. Pepcid Complete (calcium carbonate/famotidine/Mg hydroxide)." Johnson and Johnson/McNeil Consumer

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.