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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Carboxymethylcellulose Sodium
Brand Name
Retaine Cmc
Generic Name
Carboxymethylcellulose Sodium
Active Ingredient
Carboxymethylcellulose Sodium, UnspecifiedCategory
Non-Standardized Food Allergenic Extract [EPC]
Variants
1
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 5 mg/mL | SOLUTION/ DROPS | OPHTHALMIC | 54799-460 |
Detailed information about Retaine Cmc
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Retaine Cmc, you must consult a qualified healthcare professional.
Carboxymethylcellulose Sodium is a versatile cellulose derivative used as an ocular lubricant, a bulk-forming laxative, and a standardized chemical allergen extract for diagnostic testing.
Dosage for Carboxymethylcellulose Sodium varies significantly based on the condition being treated and the specific formulation used.
Since Carboxymethylcellulose Sodium is not systemically absorbed into the bloodstream, no dosage adjustments are typically required for patients with kidney disease. However, patients on fluid-restricted diets (common in end-stage renal disease) must be cautious when taking the oral form, as it requires significant water intake.
There are no known requirements for dosage adjustment in patients with liver impairment, as the drug does not undergo hepatic metabolism.
Elderly patients are more prone to dry eye and constipation. While no specific dose reduction is needed, these patients should be monitored for their ability to self-administer eye drops correctly (considering issues like arthritis or tremors) and for adequate hydration when using oral forms.
If you are using this medication on a schedule and miss a dose, apply or take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and resume your regular schedule. Do not double the dose to catch up.
An overdose of eye drops is unlikely to cause serious systemic problems. Excessive use may result in temporary blurred vision or a sticky residue on the eyelids. If the drops are accidentally swallowed, contact a Poison Control Center, although the toxicity is extremely low.
Taking too much oral CMC without enough water can lead to intestinal obstruction or fecal impaction. Symptoms include severe abdominal pain, vomiting, and the inability to pass gas or stool. Seek emergency medical attention if these symptoms occur.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance.
Most patients tolerate Carboxymethylcellulose Sodium very well, especially in its ophthalmic form. However, because it is a viscosity-enhancing agent, certain physical sensations are common:
> Warning: Stop taking Carboxymethylcellulose Sodium, Unspecified and call your doctor immediately if you experience any of these.
Carboxymethylcellulose Sodium is generally considered safe for long-term use. Unlike 'redness-relief' drops (vasoconstrictors), CMC does not cause 'rebound' redness. However, long-term use of preserved multi-dose bottles may lead to:
No FDA black box warnings exist for Carboxymethylcellulose Sodium, Unspecified. It is classified as a low-risk substance. However, the FDA has issued general warnings for all ophthalmic products regarding contamination risks. In 2023 and 2024, the FDA increased oversight of artificial tear manufacturing plants due to reports of bacterial contamination (e.g., Pseudomonas aeruginosa) in certain brands. Always ensure your product is from a reputable manufacturer and the seal is intact.
Report any unusual symptoms to your healthcare provider. You may also report side effects to the FDA at 1-800-FDA-1088.
Carboxymethylcellulose Sodium is an extremely common ingredient, but its use requires adherence to specific safety protocols to prevent injury or infection. The most critical safety concern is the maintenance of sterility for ophthalmic products.
No FDA black box warnings for Carboxymethylcellulose Sodium, Unspecified. It is widely considered one of the safest pharmacological agents available when used as directed.
While CMC is often used as a 'control' in allergy testing because it is usually non-reactive, rare cases of hypersensitivity exist. Patients who have had a reaction to other cellulose-based products (like methylcellulose or hydroxypropyl methylcellulose) should use CMC with caution. If you experience itching, rash, or difficulty breathing, discontinue use immediately.
The tip of the dispensing container must never touch any surface, including the eye or skin. Contamination of the dropper can lead to serious eye infections, which in extreme cases can result in vision loss. If the solution changes color or becomes cloudy, discard it immediately.
When used as a bulk-forming laxative, CMC must be taken with sufficient fluid. If the powder is swallowed without enough water, it can swell in the esophagus (the tube connecting the mouth to the stomach), leading to choking or obstruction. Do not take this product if you have difficulty swallowing.
If you experience eye pain, changes in vision, continued redness, or irritation of the eye, and the condition worsens or persists for more than 72 hours, discontinue use and consult an eye care professional. These may be signs of a more serious condition like an infection, a foreign body in the eye, or corneal damage.
For standard over-the-counter use, intensive laboratory monitoring is not required. However, specific situations may warrant oversight:
Carboxymethylcellulose Sodium may cause temporary blurring of vision immediately after application. Do not drive, operate heavy machinery, or perform any activity requiring clear vision until your sight has fully cleared. This typically takes less than five minutes but varies by individual and product viscosity.
There are no known direct interactions between alcohol and Carboxymethylcellulose Sodium. However, alcohol consumption can exacerbate systemic dehydration, which may worsen the symptoms of dry eye and constipation, potentially reducing the perceived efficacy of the medication.
There is no withdrawal syndrome associated with CMC. You may stop using it at any time. However, if you are using it for a chronic condition like dry eye, your symptoms will likely return once the protective coating provided by the drug is washed away.
> Important: Discuss all your medical conditions with your healthcare provider before starting Carboxymethylcellulose Sodium, Unspecified.
There are no known 'never-use' drug-drug interactions for Carboxymethylcellulose Sodium due to its lack of systemic absorption. However, in the context of Allergy Testing, CMC should not be administered if the patient is currently experiencing a severe, uncontrolled systemic allergic reaction, as the diagnostic test could exacerbate the condition.
While not a chemical interaction, using CMC simultaneously with other medicated eye drops (such as glaucoma drops or antibiotic drops) can interfere with the absorption of the second medication. The thick film created by CMC can act as a physical barrier.
As a bulk-forming agent, CMC can trap other orally administered drugs within its gel matrix, delaying or reducing their absorption into the bloodstream. This is particularly concerning for drugs with a narrow therapeutic index (where small changes in dose make a big difference).
Some formulations of CMC contain preservatives that can be absorbed by soft contact lenses, leading to irritation or lens discoloration.
There are no known significant food interactions. For the oral laxative form, a high-fiber diet is generally encouraged to work synergistically with the medication. However, avoid taking CMC with large amounts of dairy if you find it causes excessive gas or bloating.
There are no documented interactions with common herbs like St. John's Wort or Ginkgo. However, if you are taking other fiber supplements (like psyllium husk or methylcellulose), the combination may lead to excessive bloating or intestinal discomfort.
Carboxymethylcellulose Sodium does not typically interfere with standard blood or urine laboratory tests. However, its presence in the stool can theoretically alter the results of certain fecal tests (like those for fat content or specific parasites), although this is rarely clinically significant. If you are undergoing a colonoscopy or a fecal occult blood test, inform your doctor if you are using CMC-based laxatives.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking. Even though CMC is not absorbed, its physical presence in the eye or gut can change how your other medicines work.
Carboxymethylcellulose Sodium, Unspecified must NEVER be used in the following circumstances:
Conditions requiring a careful risk-benefit analysis by a healthcare provider include:
Patients who are allergic to other cellulose derivatives may exhibit cross-sensitivity to CMC. These substances include:
If you have a known allergy to any 'cellulose' ingredient in foods or cosmetics, consult an allergist before using CMC-containing medications.
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Carboxymethylcellulose Sodium, Unspecified.
Carboxymethylcellulose Sodium is not systemically absorbed after ophthalmic or oral administration. Because the drug does not enter the bloodstream, it cannot reach the developing fetus. Therefore, it is considered very low risk during all trimesters of pregnancy. It is frequently recommended by obstetricians for the treatment of pregnancy-related dry eye and constipation. No teratogenic (birth defect-causing) effects have been reported in human or animal studies.
CMC is considered safe for use during breastfeeding. Since it is not absorbed by the mother's gastrointestinal tract or ocular surface, it cannot be excreted into breast milk. There is no known risk to the nursing infant. No special precautions are required for lactating women.
Carboxymethylcellulose Sodium is widely used in children, particularly the ophthalmic drops for environmental allergies or dry eye.
Elderly patients represent the largest demographic of CMC users.
No dosage adjustment is necessary for patients with renal (kidney) impairment. The drug is not cleared by the kidneys. However, the oral form requires significant water intake; patients on dialysis or those with strict fluid limits must consult their nephrologist before using CMC as a laxative.
No dosage adjustment is necessary for patients with hepatic (liver) impairment. The drug does not undergo liver metabolism and does not affect liver enzyme systems.
> Important: Special populations require individualized medical assessment. Always inform your specialist about your use of over-the-counter products.
Carboxymethylcellulose Sodium (CMC) is a long-chain polymer of $\beta$-D-glucose units. Its primary mechanism is physical lubrication and mucoadhesion.
| Parameter | Value |
|---|---|
| Bioavailability | < 1% (essentially zero) |
| Protein Binding | N/A (not in systemic circulation) |
| Half-life | N/A (eliminated mechanically) |
| Tmax | N/A (local effect only) |
| Metabolism | None (human enzymes) |
| Excretion | Ocular: Nasolacrimal duct; Oral: Feces (100%) |
CMC is classified as a Pharmaceutical Aid/Lubricant and a Bulk-Forming Laxative. Within the context of allergy, it is a Non-Standardized Allergenic Extract. It is related to other cellulose ethers like Methylcellulose and Hydroxypropyl Cellulose, but it is unique due to its ionic (charged) nature, which enhances its water-binding and mucoadhesive properties.
Common questions about Retaine Cmc
Carboxymethylcellulose Sodium is primarily used as an ocular lubricant to treat symptoms of dry eye, such as burning, irritation, and discomfort. It works by mimicking natural tears and providing a protective, moisture-retaining film over the cornea. Additionally, it is used orally as a bulk-forming laxative to treat occasional constipation by increasing the water content and volume of the stool. In specialized medical settings, it also serves as a diagnostic allergenic extract to test for hypersensitivity. Because of its safety and viscosity, it is also a common ingredient in many processed foods and other pharmaceutical products as a stabilizer.
The most common side effects associated with the eye drop form include temporary blurred vision immediately after application, a mild stinging or burning sensation, and minor redness of the eye. Some users may also notice a slight 'crusting' or sticky residue on their eyelashes as the solution dries. When taken orally as a laxative, common side effects include abdominal bloating, gas, or a feeling of fullness. These effects are generally mild and resolve on their own. If you experience persistent eye pain or severe vision changes, you should contact your healthcare provider immediately.
There is no direct chemical interaction between alcohol and Carboxymethylcellulose Sodium, as the drug is not absorbed into your bloodstream. However, alcohol is a known dehydrating agent that can dry out the mucous membranes, potentially worsening the symptoms of dry eye or constipation that you are trying to treat. For the best results, it is recommended to limit alcohol intake and stay well-hydrated with water while using this medication. Always discuss your lifestyle habits with your doctor to ensure the most effective treatment for your specific condition.
Yes, Carboxymethylcellulose Sodium is generally considered safe for use during pregnancy and while breastfeeding. Because the molecules are too large to be absorbed into the bloodstream from the eye or the digestive tract, the medication does not reach the developing fetus or pass into breast milk. It is a common first-line recommendation for pregnant women experiencing dry eyes or constipation, which are frequent issues during pregnancy. However, as with any medication, it is always best to inform your obstetrician or healthcare provider about all the products you are using. They can provide personalized guidance based on your overall health and pregnancy stage.
When used as an eye drop for dry eye relief, Carboxymethylcellulose Sodium typically works instantly, providing soothing lubrication as soon as the drop touches the eye. However, the vision may be slightly blurry for a few moments until the drop spreads evenly. When used orally as a bulk-forming laxative, the onset of action is much slower, usually taking between 12 to 72 hours to produce a bowel movement. It is not an 'overnight' laxative and requires consistent use and plenty of water to be effective. For allergy testing, a reaction usually appears within 15 to 30 minutes of the skin test.
Yes, you can stop using Carboxymethylcellulose Sodium at any time without experiencing withdrawal symptoms or physical dependence. It is not a habit-forming medication. However, because it provides a temporary physical coating, your symptoms of dry eye or constipation will likely return once the medication's effect wears off if the underlying cause has not been addressed. If you find that you need to use the drops more than four times a day for long-term relief, you should consult an eye specialist. They can help determine if a different treatment or a preservative-free formulation would be better for your long-term ocular health.
If you are using Carboxymethylcellulose Sodium on a regular schedule and miss a dose, simply apply the eye drops or take the oral dose as soon as you remember. If it is almost time for your next scheduled dose, skip the missed one and continue with your regular routine. Do not use extra medicine or 'double up' the dose to make up for the one you missed. Since this medication is often used 'as needed' for symptom relief, missing a dose is generally not a cause for concern. For the oral form, just ensure you drink plenty of water with your next dose to maintain its effectiveness.
No, Carboxymethylcellulose Sodium does not cause weight gain. It is not absorbed into the body and has no caloric value that would contribute to fat storage. In fact, because it is a type of fiber that expands in the stomach when taken orally with water, it may actually promote a feeling of fullness (satiety), which some people find helpful for appetite control. However, it is not approved or intended as a weight-loss medication. Any sudden or unexplained weight gain while using this or any other product should be discussed with a healthcare professional to rule out other medical conditions.
Carboxymethylcellulose Sodium is generally safe to use with other medications, but timing is important. When using other eye drops, you should wait at least 5 to 10 minutes between products to prevent the CMC from washing out the other drug or blocking its absorption. If you are taking oral medications, the bulk-forming nature of CMC can slow down the absorption of other drugs in your stomach. It is recommended to take other oral medicines at least 2 hours before or 2 hours after taking CMC laxatives. Always provide your doctor or pharmacist with a full list of your current medications to avoid any physical interference between treatments.
Yes, Carboxymethylcellulose Sodium is widely available as a generic product and is also the active ingredient in many well-known brand-name artificial tears, such as Refresh Tears. Generic versions are required by the FDA to have the same quality, strength, and purity as brand-name products. You can find it in various forms, including preservative-free single-use vials and multi-dose bottles. When shopping for a generic version, ensure the active ingredient and concentration (usually 0.5% or 1.0%) match what your doctor recommended. Generic versions are typically more cost-effective while providing the same therapeutic benefits for dry eye and constipation.
Other drugs with the same active ingredient (Carboxymethylcellulose Sodium, Unspecified)