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Regular Strength

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Active ingredient
Calcium Carbonate 500 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 2019
Label revision date
September 19, 2025
Drug Information (PDF)
Prescribing information, PDF file
Active ingredient
Calcium Carbonate 500 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 2019
Label revision date
September 19, 2025
Manufacturer
MARC GLASSMAN, INC.
Registration number
M001
NDC root
68998-101
Drug Information (PDF)
Prescribing information, PDF file
Packaging Info
Packaging & NDC Codes

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

Marcs® is a regular strength antacid tablet that contains 500 mg of calcium carbonate, an ingredient that helps neutralize stomach acid. You can use Marcs® to relieve symptoms such as heartburn, acid indigestion, sour stomach, and upset stomach associated with these conditions.

These chewable tablets come in assorted fruit flavors and are gluten-free, making them a convenient option for those seeking relief from digestive discomfort.

Uses

If you're experiencing discomfort from heartburn, acid indigestion, or a sour stomach, this medication can help relieve those symptoms. It is also effective for soothing an upset stomach that may be associated 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) or nonteratogenic effects reported. This makes it a safe option for managing your digestive discomfort.

Dosage and Administration

If you are an adult or a child aged 12 years and older, you can take this medication by chewing 2 to 4 tablets whenever you experience symptoms, or as your doctor recommends. It's important to chew the tablets thoroughly and not swallow them whole, as this helps the medication work effectively.

Be mindful not to use this medication for symptoms that last longer than 2 weeks unless your doctor has specifically advised you to do so. If your symptoms persist, it's best to consult with a healthcare professional for further guidance.

What to Avoid

You can feel reassured that there are no specific contraindications, controlled substance classifications, or concerns regarding abuse, misuse, or dependence associated with this medication. This means that, based on the available information, there are no particular situations or conditions under which you should avoid using it. Always consult with your healthcare provider if you have any questions or concerns about your treatment.

Side Effects

When using this product, it's important to be aware of potential side effects and interactions. You should consult with a doctor or pharmacist if you are currently taking any prescription medications, as antacids can interact with them. Common side effects may include discomfort or changes in digestion.

To ensure your safety, do not exceed 15 tablets in a 24-hour period, and if you are pregnant, limit your intake to no more than 10 tablets in the same timeframe. Additionally, avoid using the maximum dosage for more than two weeks unless directed by a healthcare professional.

Warnings and Precautions

Before using this product, it's important to consult with your doctor or pharmacist, especially if you are currently taking any prescription medications, as antacids can interact with them. Be mindful of the dosage: do not exceed 15 tablets in a 24-hour period, and if you are pregnant, limit your intake to no more than 10 tablets in that same timeframe. Additionally, avoid using the maximum dosage for more than two weeks unless directed by your doctor.

If you experience any unusual symptoms or have concerns while using this product, stop taking it and reach out to your doctor for guidance. Your health and safety are paramount, so always follow these precautions to ensure safe use.

Overdose

Taking more than 15 tablets in a 24-hour period can lead to an overdose, which is a serious condition. If you are pregnant, it’s important to limit your intake to no more than 10 tablets in the same timeframe to prevent any risks to you and your baby. Additionally, using the maximum dosage for more than two weeks should only be done under the guidance of a doctor to avoid potential overdose.

If you suspect an overdose, look out for signs such as unusual drowsiness, confusion, or difficulty breathing. In such cases, it’s crucial to seek immediate medical help. Always prioritize your health and safety by following dosage guidelines carefully.

Pregnancy Use

If you are pregnant, it is important to be cautious with medication. You should not take more than 10 tablets in a 24-hour period. This guideline helps ensure your safety and the safety of your developing baby. Always consult with your healthcare provider before taking any medication during pregnancy to discuss potential risks and appropriate dosages.

Lactation Use

If you are breastfeeding or planning to breastfeed, it's important to know that there is no specific information available about the use of this product in nursing mothers. Additionally, there are no details regarding whether this product may be present in breast milk or any precautions you should take while lactating.

Given this lack of information, it may be wise to consult with your healthcare provider to discuss any concerns or questions you have about using this product while breastfeeding. Your health and the well-being of your baby are paramount, so seeking professional advice can help you make informed decisions.

Pediatric Use

It's important to keep this medication out of reach of children to ensure their safety. For adults and children aged 12 years and older, the recommended use is to chew 2 to 4 tablets when symptoms occur, or as directed by a doctor. Please remember that the tablets should not be swallowed whole; they need to be chewed to work effectively. Always consult with a healthcare professional if you have any questions about using this medication for your child.

Geriatric Use

When it comes to using this medication in older adults, there is no specific information available about dosage adjustments, safety concerns, or special precautions. This means that if you or a loved one is an older adult, it’s important to consult with a healthcare provider for personalized advice. They can help determine the best approach based on individual health needs and any other medications being taken. Always prioritize open communication with your healthcare team to ensure safe and effective treatment.

Renal Impairment

If you have kidney 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 for the medication do not include special monitoring or safety considerations tailored for patients with renal impairment (kidney issues).

Always consult your healthcare provider for personalized advice and to ensure that any medication you take is safe and appropriate for your kidney health. They can provide guidance based on your individual situation and any other health factors you may have.

Hepatic Impairment

If you have liver problems, it's important to know that the drug insert does not provide specific information about dosage adjustments, special monitoring, or precautions for your condition. This means that there are no tailored guidelines for how this medication may affect you if you have hepatic impairment (liver issues).

Always consult your healthcare provider for personalized advice and to discuss any concerns regarding your liver health and how it may relate to your treatment. They can help ensure that you receive the safest and most effective care.

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 with your doctor or pharmacist to ensure that everything works well together. This helps prevent any potential issues and ensures you get the most benefit from your treatments.

While there are no specific drug interactions or laboratory test interactions noted, discussing all your medications and any tests with your healthcare provider is always a wise choice. They can provide personalized advice and help you manage your health safely.

Storage and Handling

To ensure the best performance of your product, store it at room temperature. It's important to keep the container tightly closed when not in use to protect the contents from contamination and maintain their effectiveness.

By following these simple storage guidelines, you can help ensure the safety and reliability of the product. Always handle it with care to avoid any damage.

Additional Information

You will take this medication orally. There are no additional details available regarding laboratory tests, abuse potential, patient counseling, or postmarketing experiences. If you have any questions or concerns about your treatment, be sure to discuss them with your healthcare provider.

FAQ

What is Marcs®?

Marcs® is a regular strength antacid tablet that contains 500 mg of calcium carbonate.

What symptoms does Marcs® relieve?

Marcs® relieves heartburn, acid indigestion, sour stomach, and upset stomach associated with these symptoms.

How should I take Marcs®?

Adults and children 12 years and over should chew 2-4 tablets as symptoms occur, or as directed by a doctor. Do not swallow tablets whole.

Are there any warnings for using Marcs®?

Yes, ask a doctor or pharmacist before use if you are taking a prescription drug, as antacids may interact with certain medications.

What is the maximum dosage for Marcs®?

Do not take more than 15 tablets in 24 hours, and if pregnant, do not take more than 10 tablets in 24 hours.

Is Marcs® gluten-free?

Yes, Marcs® is gluten-free.

Who distributes Marcs®?

Marcs® is distributed by Marc Glassman, Inc., located in Cleveland, OH.

Is there any information about teratogenic effects?

No teratogenic effects are mentioned for Marcs®.

How should I store Marcs®?

Store Marcs® at room temperature and keep the container tightly closed.

What should I do if symptoms persist?

Do not take Marcs® for symptoms that persist for more than 2 weeks unless advised by a doctor.

Packaging Info

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

Packaging configurations for Regular Strength.
Details

Drug Information (PDF)

This file contains official product information for Regular Strength, 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 heartburn, acid indigestion, and sour stomach. It is also effective in alleviating 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 over are instructed to chew 2 to 4 tablets as symptoms occur, or as directed by a healthcare professional. It is essential that the tablets are chewed thoroughly and not swallowed whole.

Patients should not use this medication for symptoms that persist for more than 2 weeks without consulting a doctor.

Contraindications

There are no contraindications associated with the use of this product. It is deemed safe for use in the absence of specific conditions or situations that would warrant avoidance.

Warnings and Precautions

Healthcare professionals should advise patients to consult a doctor or pharmacist prior to using this product if they are currently taking any prescription medications, as antacids may interact with certain drugs.

When administering this product, it is crucial to adhere to the following dosage guidelines: patients should not exceed 15 tablets within a 24-hour period. For pregnant individuals, the maximum dosage should not exceed 10 tablets in a 24-hour period. Furthermore, the maximum dosage should not be utilized for more than 2 weeks unless directed and monitored by a healthcare provider.

These precautions are essential to ensure the safe and effective use of the product, minimizing the risk of adverse effects and potential drug interactions.

Side Effects

Patients may experience various adverse reactions when using this product. It is important to note that individuals should consult a doctor or pharmacist prior to use if they are currently taking any prescription medications, as antacids may interact with certain drugs.

In terms of usage guidelines, patients are advised not to exceed 15 tablets within a 24-hour period. For pregnant individuals, the maximum recommended dosage is limited to 10 tablets in a 24-hour timeframe. Furthermore, it is crucial that the maximum dosage is not utilized for more than 2 weeks unless under the guidance and supervision of a healthcare professional.

These precautions are essential to minimize the risk of adverse effects and ensure safe usage of the 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, if they are taking other medications concurrently with antacids. This consultation is essential to ensure safe and effective use of all medications involved.

No specific drug interactions or laboratory test interactions have been identified for the other medications in this context. Therefore, monitoring and dosage adjustments are not indicated based on the available information.

Packaging & NDC

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

Packaging configurations for Regular Strength.
Details

Pediatric Use

Pediatric patients should be advised to keep this medication out of reach of children. For those aged 12 years and older, the recommended dosage is to chew 2-4 tablets as symptoms occur, or as directed by a healthcare professional. It is important to note that tablets should not be swallowed whole.

Geriatric Use

Elderly patients may not have specific information regarding the use of this medication, including dosage adjustments, safety concerns, or special precautions. Therefore, healthcare providers should exercise caution when prescribing this medication to geriatric patients. It is advisable to monitor these patients closely for any adverse effects or changes in therapeutic response, given the lack of targeted data for this population.

Pregnancy

Pregnant patients should not exceed a dosage of 10 tablets within a 24-hour period. This limitation is crucial to minimize potential risks to fetal outcomes. Healthcare professionals are advised to counsel women of childbearing potential regarding the importance of adhering to this dosage recommendation to ensure the safety of both the mother and the developing fetus.

Lactation

There is no specific information available regarding the use of this product in lactating mothers. Additionally, there is no data on the potential for excretion of the product in breast milk or any related precautions for breastfeeding. Healthcare professionals should consider this lack of information when advising lactating mothers.

Renal Impairment

Patients with renal impairment have not been specifically addressed in the available prescribing information. There are no dosage adjustments, special monitoring requirements, or safety considerations outlined for individuals with reduced kidney function. Healthcare professionals should exercise caution and consider the lack of data when prescribing to this patient population.

Hepatic Impairment

Patients with hepatic impairment have not been specifically studied in relation to the use of this medication. Consequently, there are no 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 event of an overdose, it is critical to adhere to the recommended dosage guidelines to prevent adverse effects. The maximum allowable dosage for adults is 15 tablets within a 24-hour period. Exceeding this limit may lead to serious health complications.

For pregnant individuals, the maximum dosage is further restricted to 10 tablets in a 24-hour period. This precaution is essential to mitigate the risk of overdose and protect both maternal and fetal health.

Additionally, the maximum dosage should not be utilized for more than 2 weeks unless specifically directed and monitored by a healthcare professional. Prolonged use at maximum dosage without medical supervision increases the risk of overdose and associated complications.

In cases of suspected overdose, immediate medical attention is advised. Healthcare professionals should assess the patient's condition and initiate appropriate management procedures based on the severity of symptoms and the specific circumstances of the overdose.

Nonclinical Toxicology

No teratogenic or non-teratogenic effects have been reported in the available nonclinical studies. Additionally, there is no information regarding animal pharmacology and toxicology. The absence of data limits the assessment of potential risks associated with the use of the compound in these contexts.

Postmarketing Experience

No postmarketing experience details are available in the insert text.

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 necessity of proper storage to ensure the safety of young individuals.

Storage and Handling

The product is supplied in a container that must be kept tightly closed to maintain its integrity. It should be stored at room temperature to ensure optimal stability and efficacy.

Additional Clinical Information

The medication is administered orally. There are no additional details available regarding laboratory tests, abuse information, patient counseling, or postmarketing experience.

Drug Information (PDF)

This file contains official product information for Regular Strength, 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 Regular Strength, 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.