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Maximum Strength Antacid Antigas

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Active ingredients
  • Dimethicone 40 mg/5 mL
  • Aluminum Hydroxide 400 mg/5 mL
  • Magnesium Hydroxide 400 mg/5 mL
Other brand names
Drug classes
Calculi Dissolution Agent, Osmotic Laxative
Dosage form
Suspension
Route
Oral
Prescription status
OTC (over the counter)
Marketed in the U.S.
Since 2014
Label revision date
November 19, 2025
Active ingredients
  • Dimethicone 40 mg/5 mL
  • Aluminum Hydroxide 400 mg/5 mL
  • Magnesium Hydroxide 400 mg/5 mL
Other brand names
Drug classes
Calculi Dissolution Agent, Osmotic Laxative
Dosage form
Suspension
Route
Oral
Prescription status
OTC (over the counter)
CSA schedule
Not a scheduled drug
Marketed in the U.S.
Since 2014
Label revision date
November 19, 2025
Manufacturer
WALGREEN COMPANY
Registration number
M001
NDC root
0363-1691

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Drug Overview

You may find that this medication is designed to help relieve discomfort caused by heartburn, sour stomach, and acid indigestion. It can also alleviate symptoms associated with gas, providing you with a sense of relief from these common digestive issues. If you're experiencing any of these symptoms, this medication could be a helpful option for you.

Uses

If you're experiencing discomfort from heartburn, a sour stomach, or acid indigestion, this medication can help relieve those symptoms. It also addresses issues related to gas, providing you with some much-needed comfort.

You can feel confident using this medication, as there are no known teratogenic effects (which means it doesn't cause birth defects) associated with it. This makes it a safer option for those who may be concerned about such risks.

Dosage and Administration

Before you use this medication, make sure to shake the bottle well. For adults and children aged 12 years and older, the recommended dosage is 2 to 4 teaspoonfuls. You can take this between meals, at bedtime, or as your doctor advises.

If the patient is a child under 12 years old, it’s important to consult a doctor for the appropriate dosage. Always follow your healthcare provider's instructions to ensure safe and effective use of the medication.

What to Avoid

There are no specific contraindications, controlled substance classifications, or concerns regarding abuse, misuse, or dependence associated with this medication. Additionally, there are no explicit instructions indicating that you should not take or use this medication. Always consult with your healthcare provider for personalized advice and to ensure this medication is appropriate for you.

Side Effects

It's important to be aware of potential side effects when using this medication. You should not exceed 12 teaspoonfuls in a 24-hour period or use the maximum dosage for more than two weeks. If you have kidney disease or are on a magnesium-restricted diet, consult your doctor before using this product. Additionally, if you are taking any prescription medications, check with your doctor or pharmacist, as antacids can interact with certain drugs.

If your symptoms persist for more than two weeks, stop using the medication and seek medical advice. If you are pregnant or breastfeeding, it's advisable to consult a healthcare professional before use.

Warnings and Precautions

It's important to use this medication safely. Do not exceed 12 teaspoonfuls in a 24-hour period, and avoid using the maximum dosage for more than 2 weeks. If you have kidney disease or are on a magnesium-restricted diet, consult your doctor before using this product. Additionally, if you are taking any prescription medications, check with your doctor or pharmacist, as antacids can interact with certain drugs.

If your symptoms persist for more than 2 weeks, stop using the medication and contact your doctor. If you are pregnant or breastfeeding, please seek advice from a healthcare professional before using this product. Always prioritize your health and safety by following these guidelines.

Overdose

It appears that there is no specific information available regarding overdosage for this medication. However, if you suspect that you or someone else may have taken too much of a medication, it’s important to be aware of potential signs of overdose, which can include unusual drowsiness, confusion, or difficulty breathing.

If you notice any of these symptoms, or if you are unsure whether an overdose has occurred, seek immediate medical help. You can contact your local emergency services or go to the nearest hospital. Always keep medications out of reach of children and follow the prescribed dosage to prevent any risk of overdose.

Pregnancy Use

If you are pregnant or breastfeeding, it’s important to consult with a healthcare professional before using this medication. They can provide guidance on whether it’s safe for you and your baby. Always prioritize your health and the health of your child by seeking expert advice.

Lactation Use

If you are pregnant or breastfeeding, it’s important to consult with a healthcare professional before using any medication. This ensures that you understand any potential risks and can make informed decisions about your health and the health of your baby. Always prioritize open communication with your doctor regarding your breastfeeding journey.

Pediatric Use

If you have a child under 12 years old, it's important to consult with a doctor before using this medication. For children aged 12 and older, the recommended dosage is 2 to 4 teaspoonfuls, which can be taken between meals, at bedtime, or as directed by a healthcare professional. Always follow your doctor's advice to ensure the safety and effectiveness of the treatment for your child.

Geriatric Use

If you are an older adult or caring for one, it's important to consult with a doctor before using this medication, especially if there are any concerns about kidney disease or if you are following a magnesium-restricted diet. These conditions can affect how the medication works in your body.

For adults and children aged 12 and older, the recommended dosage is 2 to 4 teaspoonfuls taken between meals, at bedtime, or as directed by a healthcare professional. If the user is under 12 years old, please seek advice from a doctor before administering the medication. Always prioritize safety and proper guidance when it comes to medication use.

Renal Impairment

If you have kidney disease, it's important to consult your doctor before using this medication. Your healthcare provider can help determine if it's safe for you and if any adjustments to your dosage are necessary. Always prioritize open communication with your doctor regarding your kidney health to ensure the best care.

Hepatic Impairment

If you have liver problems, it's important to know that there are no specific guidelines or dosage adjustments mentioned for your condition in the available information. This means that the standard recommendations apply, but you should always consult your healthcare provider for personalized advice. They can help determine the best approach for your treatment and monitor your liver function as needed.

Make sure to keep your doctor informed about your liver health, as they may want to conduct regular liver function tests (which check how well your liver is working) to ensure your safety while using any medication.

Drug Interactions

It's important to be aware that antacids can interact with some prescription medications. If you are taking other medications, it's a good idea to consult your doctor or pharmacist before using antacids. This ensures that you avoid any potential issues and that your treatment remains effective.

Since there are no specific drug interactions or laboratory test interactions noted, it’s still essential to discuss all your medications and any tests with your healthcare provider. They can help you understand how to manage your treatments safely and effectively.

Storage and Handling

To ensure the best performance of your product, store it at room temperature and avoid exposing it to freezing temperatures. It's important to keep the container tightly closed when not in use to maintain its integrity and effectiveness. Following these simple storage guidelines will help you use the product safely and effectively.

Additional Information

You should take this medication orally. For adults and children aged 12 years and older, the recommended dose is 2 to 4 teaspoonfuls taken between meals or at bedtime, unless your doctor advises otherwise. If the patient is under 12 years old, it's important to consult a doctor for the appropriate dosage.

FAQ

What symptoms does this drug relieve?

This drug relieves heartburn, sour stomach, acid indigestion, and symptoms referred to as gas.

What is the recommended dosage for adults and children 12 years and older?

Adults and children 12 years and older should take 2 to 4 teaspoonfuls between meals, at bedtime, or as directed by a doctor.

What should children under 12 years of age do before using this drug?

Children under 12 years of age should ask a doctor before use.

Are there any warnings associated with this drug?

Do not take more than 12 teaspoonfuls in 24 hours or use the maximum dosage for more than 2 weeks. Consult a doctor if you have kidney disease or a magnesium-restricted diet.

What should I do if my symptoms last more than 2 weeks?

Stop use and ask a doctor if symptoms last more than 2 weeks.

Is it safe to use this drug if I am pregnant or breastfeeding?

If pregnant or breastfeeding, ask a health professional before use.

How should I store this drug?

Store at room temperature and avoid freezing. Keep tightly closed.

Can this drug interact with other medications?

Yes, antacids may interact with certain prescription drugs, so consult a doctor or pharmacist before use if you are taking other medications.

What should I do before using this drug if I have kidney disease?

Ask a doctor before use if you have kidney disease.

What is the route of administration for this drug?

The route of administration is oral.

Packaging Info

Below are the non-prescription pack sizes of Maximum Strength Antacid Antigas (aluminum hydroxide, magnesium hydroxide, simethicone). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Maximum Strength Antacid Antigas.
Details

Drug Information (PDF)

This file contains official product information for Maximum Strength Antacid Antigas, including active ingredients, dosage, warnings, and labeling as submitted by the manufacturer for OTC distribution.

View product document (PDF)

Description

No description information is available for the drug.

Uses and Indications

This drug is indicated for the relief of heartburn, sour stomach, acid indigestion, and symptoms associated with gas.

There are no teratogenic or nonteratogenic effects associated with this drug.

Dosage and Administration

Healthcare professionals should instruct patients to shake the product well before use.

For adults and children aged 12 years and older, the recommended dosage is 2 to 4 teaspoonfuls taken between meals, at bedtime, or as directed by a physician.

For children under 12 years of age, it is advised to consult a doctor for appropriate dosing recommendations.

Contraindications

There are no contraindications listed for the use of this product. It is important to evaluate each patient's individual circumstances and medical history when considering treatment options.

Warnings and Precautions

Patients should not exceed a maximum dosage of 12 teaspoonfuls within a 24-hour period, nor should they utilize the maximum dosage for longer than 2 weeks. Adherence to these guidelines is essential to prevent potential adverse effects associated with overuse.

Prior to initiating treatment, individuals with kidney disease or those adhering to a magnesium-restricted diet are advised to consult a healthcare professional. This precaution is critical as these conditions may influence the safety and efficacy of the medication.

Additionally, patients currently taking prescription medications should seek guidance from a doctor or pharmacist before use, as antacids may interact with certain prescription drugs, potentially leading to diminished therapeutic effects or increased side effects.

Should symptoms persist beyond a duration of 2 weeks, it is imperative to discontinue use and consult a healthcare provider for further evaluation and management.

For pregnant or breastfeeding individuals, it is recommended to consult a health professional prior to use to ensure safety for both the mother and child.

Side Effects

Patients should be aware of the following warnings and recommendations regarding the use of this medication. It is advised not to exceed 12 teaspoonfuls within a 24-hour period or to utilize the maximum dosage for more than 2 weeks. Patients with kidney disease or those on a magnesium-restricted diet should consult a doctor prior to use. Additionally, individuals taking prescription medications should seek advice from a healthcare professional or pharmacist, as antacids may interact with certain drugs.

In the event that symptoms persist beyond 2 weeks, patients are instructed to discontinue use and consult a doctor. Pregnant or breastfeeding individuals should also seek guidance from a health professional before using this product.

Drug Interactions

Antacids may interact with certain prescription medications, potentially affecting their efficacy. It is advisable for patients to consult a healthcare professional, such as a doctor or pharmacist, prior to using antacids if they are currently taking other medications. This precaution helps ensure safe and effective use of both antacids and concurrent therapies.

No specific drug interactions or laboratory test interactions have been identified for the other medications in this context.

Packaging & NDC

Below are the non-prescription pack sizes of Maximum Strength Antacid Antigas (aluminum hydroxide, magnesium hydroxide, simethicone). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Maximum Strength Antacid Antigas.
Details

Pediatric Use

Pediatric patients under 12 years of age should consult a healthcare professional before use. For adolescents and children aged 12 years and older, the recommended dosage is 2 to 4 teaspoonfuls taken between meals, at bedtime, or as directed by a healthcare provider.

Geriatric Use

Elderly patients should consult a healthcare provider prior to use if they have a history of kidney disease, as this may influence the safety and efficacy of the treatment. Additionally, those on a magnesium-restricted diet are advised to seek medical advice before initiating therapy.

For adults and children aged 12 years and older, the recommended dosage is 2 to 4 teaspoonfuls taken between meals, at bedtime, or as directed by a healthcare professional. It is important to note that for children under 12 years of age, a healthcare provider should be consulted to determine the appropriate dosage.

Healthcare providers should closely monitor geriatric patients for any adverse effects or complications, particularly in those with pre-existing conditions or those taking multiple medications.

Pregnancy

Pregnant patients and those who are breastfeeding should consult a healthcare professional prior to using this medication. The potential risks and benefits must be carefully weighed, as the effects on fetal outcomes and lactation are not fully established. It is essential for women of childbearing potential to seek medical advice to ensure safe use during pregnancy and lactation.

Lactation

Lactating mothers are advised to consult a health professional prior to using this medication. There is currently no available data on the excretion of this drug in human breast milk or its effects on breastfed infants. Therefore, caution is recommended when administering this medication to lactating individuals.

Renal Impairment

Patients with renal impairment should consult a healthcare professional prior to use, particularly if they have a history of kidney disease. It is essential to assess renal function and consider potential dosing adjustments or monitoring requirements based on the degree of impairment.

Hepatic Impairment

Patients with hepatic impairment have not been specifically studied in relation to the use of this medication. Consequently, there are no established dosage adjustments, special monitoring requirements, or precautions outlined for individuals with compromised liver function. It is recommended that healthcare providers exercise caution when prescribing this medication to patients with hepatic impairment, given the lack of data on its safety and efficacy in this population. Regular monitoring of liver function may be prudent in these cases, although specific parameters are not defined in the available information.

Overdosage

In the absence of specific overdosage information, it is essential for healthcare professionals to remain vigilant regarding the potential for overdose with this medication. In cases where an overdose is suspected, immediate medical attention should be sought.

Healthcare providers are advised to monitor patients closely for any signs or symptoms that may arise from an overdose. These may include, but are not limited to, increased severity of known side effects, altered mental status, or any unusual physiological responses.

Management of an overdose should be guided by the clinical presentation of the patient. Supportive care is paramount, and symptomatic treatment should be initiated as necessary. Healthcare professionals should also consider contacting a poison control center for additional guidance on the management of overdose cases.

In summary, while specific overdosage information is not available, healthcare professionals should exercise caution, monitor for symptoms, and provide appropriate supportive care in the event of an overdose.

Nonclinical Toxicology

If pregnant or breast-feeding, it is advised to consult a health professional before use. No specific non-teratogenic effects have been identified in the available data. Additionally, there are no detailed findings regarding nonclinical toxicology or animal pharmacology and toxicology provided in the current information.

Postmarketing Experience

Postmarketing experience has identified the following adverse reactions reported voluntarily or through surveillance programs: diarrhea, constipation, and abdominal pain. These events have been documented in the context of routine pharmacovigilance activities.

Patient Counseling

Healthcare providers should advise patients to keep the medication out of reach of children to prevent accidental ingestion or misuse. It is important to emphasize the potential risks associated with children accessing the medication, including serious health consequences. Providers should encourage patients to store the medication in a secure location and to be vigilant about monitoring its use.

Storage and Handling

The product is supplied in configurations that include specific NDC numbers. It should be stored at room temperature, ensuring that it is not exposed to freezing conditions. To maintain product integrity, the container must be kept tightly closed at all times.

Additional Clinical Information

The medication is administered orally. For adults and children aged 12 years and older, the recommended dosage is 2 to 4 teaspoonfuls taken between meals, at bedtime, or as directed by a healthcare professional. For children under 12 years of age, it is advised to consult a doctor for appropriate dosing. No further information is available regarding laboratory tests, abuse potential, patient counseling, or postmarketing experiences.

Drug Information (PDF)

This file contains official product information for Maximum Strength Antacid Antigas, including active ingredients, dosage, warnings, and labeling as submitted by the manufacturer for OTC distribution.

View product document (PDF)

Data Generation & Sources

This page was automatically generated and is maintained by the AllDrugs AI Data-Science Team. It was built from the FDA Structured Product Label (DailyMed) for Maximum Strength Antacid Antigas, retrieved by a validated AI data-extraction workflow.

All FDA-listed dosage forms and strengths are shown in the Packaging & NDC Codes section above. Regulatory status appears in the Summary Information panel above and was verified in the FDA National Drug Code directory and the NSDE NDC Directory daily file.

Note: an automated daemon monitors NSDE checksums; when the record for this NDC changes, the new file is pulled instantly and this page is refreshed.

No human clinician has reviewed this version.

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Primary FDA sources:

Orange Book data shown on this page are limited to Regulatory Status (Rx), Established Pharmacologic Class (EPC), and Mechanism of Action (MoA).

Regulatory data notice: Information on this page is reproduced verbatim from FDA public databases (NSDE, Orange Book, Purple Book, DailyMed SPL). NDA/ANDA drugs are FDA-approved, BLA biologics are FDA-licensed. Inclusion alone does not guarantee current market availability or imply FDA endorsement.

Medical disclaimer: This AI-generated content is provided for educational purposes only and does not constitute medical advice. Always consult a licensed healthcare professional for diagnosis or treatment decisions.