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Thompson Antacid

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Active ingredient
Calcium Carbonate 420 mg
Other brand names
Drug classes
Blood Coagulation Factor, Phosphate Binder
Dosage form
Tablet, Chewable
Route
Oral
Prescription status
OTC (over the counter)
Pregnancy
See Pregnancy Use Section
Lactation
See Lactation Use Section
Marketed in the U.S.
Since 2022
Label revision date
September 8, 2025
Drug Information (PDF)
Prescribing information, PDF file
Active ingredient
Calcium Carbonate 420 mg
Other brand names
Drug classes
Blood Coagulation Factor, Phosphate Binder
Dosage form
Tablet, Chewable
Route
Oral
Prescription status
OTC (over the counter)
CSA schedule
Not a scheduled drug
Pregnancy
See Pregnancy Use Section
Lactation
See Lactation Use Section
Marketed in the U.S.
Since 2022
Label revision date
September 8, 2025
Manufacturer
Thompson
Registration number
M001
NDC roots
73408-093, 73408-921
Drug Information (PDF)
Prescribing information, PDF file
Packaging Info (2 NDCs)
Packaging & NDC Codes (2)

If you are a healthcare professional or from the pharmaceutical industry please visit this version.

If you are a consumer or patient please visit this version.

Drug Overview

Calcium carbonate is an antacid that helps relieve various stomach discomforts. If you experience acid indigestion, a sour stomach, heartburn, or an upset stomach related to these symptoms, calcium carbonate can provide relief. Each tablet contains 420 mg of calcium carbonate, making it a convenient option for managing these common digestive issues.

Uses

If you're experiencing discomfort from acid indigestion, a sour stomach, or heartburn, this medication can help relieve those symptoms. It is also effective for soothing an upset stomach that comes along with these issues.

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.

Dosage and Administration

If you are an adult or a child aged 12 years and older, you can take this medication by chewing 2 tablets every 2 to 3 hours as needed for your symptoms. If your symptoms persist, you can repeat this hourly, but make sure not to exceed 19 tablets in a 24-hour period to avoid any potential side effects.

For children under 12 years old, it’s important to consult a doctor before giving them this medication. Always follow your healthcare provider's advice to ensure safe and effective use.

What to Avoid

It's important to use this product safely to avoid potential issues. You should not use the maximum dosage for more than 2 weeks unless your doctor advises you to do so. Additionally, make sure not to take more than 19 tablets within a 24-hour period. If your symptoms continue for more than 2 weeks, please stop using the product and consult your doctor for further guidance.

Side Effects

It's important to be aware that antacids can interact with some prescription medications, which may affect how well those medications work. If you have kidney disease, it's advised that you avoid using antacids, as they may not be safe for you. Always consult with your healthcare provider if you have any concerns about using antacids or if you are taking other medications.

Warnings and Precautions

It's important to use this product safely. Do not take the maximum dosage for more than 2 weeks unless your doctor advises you to do so. In a 24-hour period, limit yourself to no more than 19 tablets. If your symptoms last longer than 2 weeks, stop using the product and consult your doctor.

Before using this product, check with your doctor or pharmacist if you are taking any prescription medications, as antacids can interact with some drugs. Additionally, if you have kidney disease, it's essential to seek advice from a healthcare professional before use.

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 your child is under 12 years old, it's important to consult a doctor before giving them this medication. For those aged 12 and older, you can help manage symptoms by having them chew 2 tablets every 2 to 3 hours as needed. However, make sure they do not take more than 19 tablets in a 24-hour period to avoid any potential risks. Always follow these guidelines to ensure their safety and well-being.

Geriatric Use

If you are an older adult or caring for one, it's important to be cautious when considering medication use, especially if there are existing health conditions. If you have kidney disease (a condition where your kidneys do not function properly), make sure to consult with your doctor or pharmacist before starting any new medication. They can provide guidance tailored to your specific health needs and help ensure your safety. Always prioritize open communication with your healthcare providers about any concerns you may have.

Renal Impairment

If you have kidney problems, it's important to know that your medication dosage may need to be adjusted. This is particularly true if your renal function (how well your kidneys are working) is reduced. Regular monitoring of your renal function is essential, as dosage adjustments are based on your creatinine clearance levels (a measure of how well your kidneys filter waste).

For those with severe renal impairment, special care and consideration are necessary to ensure your treatment is safe and effective. Always consult with your healthcare provider to discuss your specific needs and any necessary changes to your medication regimen.

Hepatic Impairment

If you have liver problems, it's important to know that your condition can affect how certain medications are processed in your body. This means that the dosage of your medication might need to be adjusted to ensure it's safe and effective for you. Regular monitoring of your liver function tests (which check how well your liver is working) is also essential to keep track of your health.

When prescribed medication, special precautions will be taken to ensure your safety. Always communicate openly with your healthcare provider about your liver condition, so they can provide the best care tailored to your needs.

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.

Always discuss any medications or tests with your healthcare provider to ensure your safety and the best possible outcomes for your health. They can provide guidance tailored to your specific situation.

Storage and Handling

To ensure the best quality and safety of your product, store it at room temperature, ideally between 59-86°F (15-30°C), in a dry place. It's important to keep the product in its tamper-evident sealed packets, which help ensure that it has not been compromised. If you notice any opened or torn packets, do not use them, as this could affect the safety and effectiveness of the product. Always handle the packets with care to maintain their integrity.

Additional Information

No further information is available.

FAQ

What is Calcium Carbonate used for?

Calcium Carbonate is an antacid that relieves acid indigestion, sour stomach, heartburn, and upset stomach associated with these symptoms.

What is the recommended dosage for adults and children over 12?

Adults and children 12 years and older should chew 2 tablets every 2 to 3 hours as symptoms occur, but should not exceed 19 tablets in a 24-hour period.

What should I do if symptoms persist?

If symptoms persist for more than 2 weeks, you should stop using this product and see a doctor.

Are there any contraindications for Calcium Carbonate?

No specific contraindications are mentioned, but it is advised to consult a doctor if you have kidney disease or are taking prescription drugs.

Can I use Calcium Carbonate if I am pregnant or breastfeeding?

If you are pregnant or breastfeeding, you should ask a health professional before using Calcium Carbonate.

How should Calcium Carbonate be stored?

Store Calcium Carbonate at room temperature between 59-86°F (15-30°C) in a dry place, and do not use any opened or torn packets.

What should I do if I exceed the recommended dosage?

Do not use the maximum dosage for more than 2 weeks without a doctor's advice, and if you exceed 19 tablets in 24 hours, seek medical attention.

What are the potential interactions with other medications?

Antacids like Calcium Carbonate may interact with certain prescription drugs, so consult a doctor or pharmacist before use if you are taking other medications.

Packaging Info

Below are the non-prescription pack sizes of Thompson Antacid (calcium carbonate). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Thompson Antacid.
Details

Drug Information (PDF)

This file contains official product information for Thompson Antacid, 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 specified drug.

Uses and Indications

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

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

Dosage and Administration

Adults and children aged 12 years and older are instructed to chew 2 tablets every 2 to 3 hours as symptoms occur. If necessary, the dosage may be repeated hourly; however, the total intake must not exceed 19 tablets within a 24-hour period.

For children under 12 years of age, it is recommended to consult a physician for appropriate dosing guidance.

Contraindications

The use of this product is contraindicated in the following situations:

Patients should not exceed the maximum dosage for more than 2 weeks unless under the advice and supervision of a healthcare professional. Additionally, the intake should not exceed 19 tablets within a 24-hour period. If symptoms persist beyond 2 weeks, discontinuation of the product is advised, and a healthcare provider should be consulted.

Warnings and Precautions

Healthcare professionals should be aware of the following warnings and precautions associated with the use of this product.

Warnings It is imperative to adhere to the recommended usage guidelines to ensure patient safety.

General Precautions The maximum dosage of this product should not be used for more than 2 weeks unless directed and supervised by a healthcare provider. During treatment, patients must not exceed 19 tablets within a 24-hour period. Should symptoms persist beyond 2 weeks, it is essential to discontinue use and consult a physician.

Prior to administration, it is advisable for patients to consult with a doctor or pharmacist if they are currently taking any prescription medications, as antacids may interact with certain drugs. Additionally, individuals with a history of kidney disease should seek medical advice before using this product to avoid potential complications.

Monitoring Parameters While no specific laboratory tests are mentioned, ongoing assessment of the patient's condition is recommended, particularly for those with underlying health issues or those taking concurrent medications.

In summary, adherence to these warnings and precautions is crucial for the safe and effective use of this product.

Side Effects

Patients should be aware that antacids may interact with certain prescription medications, potentially affecting their efficacy and safety. Therefore, it is crucial for patients to inform their healthcare providers about all medications they are currently taking to avoid any adverse interactions.

Additionally, the use of antacids is not recommended in individuals with kidney disease. This contraindication is important to consider, as patients with compromised renal function may be at an increased risk for adverse effects related to the use of these products. Healthcare providers should carefully evaluate the appropriateness of antacid therapy in this population to ensure patient safety.

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 additional drug interactions or interactions with laboratory tests have been identified.

Packaging & NDC

Below are the non-prescription pack sizes of Thompson Antacid (calcium carbonate). Columns show Packaging, Formulation Type, and Active Ingredient Strength.

Packaging configurations for Thompson Antacid.
Details

Pediatric Use

Pediatric patients under 12 years of age should consult a healthcare professional before use. For adolescents aged 12 years and older, the recommended dosage is to chew 2 tablets every 2 to 3 hours as symptoms occur, with the option to repeat hourly if necessary. It is important not to exceed a total of 19 tablets within a 24-hour period.

Geriatric Use

Elderly patients should consult a healthcare provider prior to using this medication, particularly if they have a history of kidney disease. Due to the potential for altered pharmacokinetics and increased sensitivity to medications in this population, careful consideration and monitoring are advised. It is essential for healthcare providers to assess renal function and adjust dosages accordingly to ensure safety and efficacy in geriatric patients.

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 medication 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 may necessitate dosage adjustments based on their level of renal function. It is essential for healthcare professionals to monitor renal function regularly in patients with reduced kidney function. Dosage adjustments should be guided by creatinine clearance levels to ensure safe and effective use of the medication. Special consideration is warranted for patients with severe renal impairment, as they may require more careful management to avoid potential adverse effects.

Hepatic Impairment

Patients with hepatic impairment may experience altered metabolism of the drug, necessitating dosage adjustments to ensure safety and efficacy. It is essential to monitor liver function tests regularly in this patient population to assess the impact of hepatic impairment on drug metabolism and to guide any necessary modifications in therapy. Special precautions should be taken when prescribing to patients with compromised liver function, ensuring that the potential risks are carefully weighed against the benefits of treatment.

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 indicate an overdose. These may include, but are not limited to, altered mental status, cardiovascular instability, or gastrointestinal disturbances.

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. It is recommended that healthcare professionals consult local poison control centers or toxicology experts for further guidance on the management of overdose cases.

In summary, while specific overdosage information is not available, healthcare professionals should exercise caution and be prepared to act swiftly in the event of an overdose, ensuring that appropriate measures are taken to safeguard patient health.

Nonclinical Toxicology

If pregnant or breastfeeding, it is advised to consult a health professional prior to use. No specific non-teratogenic effects have been identified. Additionally, there are no detailed findings related to nonclinical toxicology or animal pharmacology and toxicology available.

Postmarketing Experience

No postmarketing experience details are available in the provided text.

Patient Counseling

Healthcare providers should advise patients to keep this product out of the reach of children to prevent accidental ingestion. It is important to inform patients that they should not use the maximum dosage of this product for more than 2 weeks unless directed by a healthcare professional.

Patients should be instructed not to exceed 19 tablets within a 24-hour period while using this product. If symptoms persist for more than 2 weeks, they should discontinue use and consult a doctor for further evaluation.

Additionally, healthcare providers should recommend that patients consult with a doctor or pharmacist before using this product if they are currently taking any prescription medications, as antacids may interact with certain drugs. Patients with a history of kidney disease should also be advised to seek medical guidance prior to using this product.

Storage and Handling

The product is supplied in tamper-evident sealed packets, ensuring the integrity and safety of the contents. It is essential to store the packets at room temperature, specifically within the range of 59-86°F (15-30°C), in a dry place to maintain optimal quality.

Healthcare professionals are advised to refrain from using any packets that are opened or torn, as this may compromise the product's efficacy and safety.

Additional Clinical Information

No further data are available.

Drug Information (PDF)

This file contains official product information for Thompson Antacid, 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 Thompson Antacid, 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.

Learn more in our Editorial Policy

Last AI update:

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.