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Azulfidine EN-Tabs vs Regular Azulfidine Key Differences

In This Article

What Are Azulfidine and Azulfidine EN-Tabs?

Azulfidine (sulfasalazine) and Azulfidine EN-Tabs (sulfasalazine delayed-release) are both prescription medications that contain the exact same active ingredient: sulfasalazine. Both forms are classified as disease-modifying antirheumatic drugs (DMARDs) and are commonly prescribed to treat inflammatory bowel disease and rheumatoid arthritis.

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The key difference between these two formulations lies not in what they contain, but in how they deliver the medication to your body. Regular Azulfidine tablets dissolve in the stomach, while Azulfidine EN-Tabs have a special enteric coating that prevents them from dissolving until they reach the intestines.

Understanding the Enteric Coating Difference

The “EN” in Azulfidine EN-Tabs stands for “enteric,” which refers to a special coating applied to the tablet. This enteric coating is designed to resist stomach acid and only dissolve when the tablet reaches the more alkaline environment of the small intestine.

Regular Azulfidine tablets do not have this protective coating. They begin dissolving as soon as they come into contact with stomach acid, releasing the sulfasalazine directly into the stomach. This immediate release can sometimes cause stomach irritation and digestive discomfort.

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Both formulations are available in 500 mg tablets and deliver the same amount of active medication to your system. The difference is simply the timing and location of where the drug is released in your digestive system.

Why the Coating Matters: Stomach Tolerability

The enteric coating in Azulfidine EN-Tabs was developed specifically to address a common problem with regular sulfasalazine tablets: stomach upset and gastrointestinal side effects. Clinical studies have shown that patients taking enteric-coated sulfasalazine experience significantly fewer and less severe digestive problems compared to those taking regular tablets.

Research demonstrates that enteric-coated formulations produce fewer cases of abdominal pain, loss of appetite, gas, diarrhea, heartburn, nausea, and vomiting. In fact, when given the choice, a large majority of patients preferred the enteric-coated version over regular tablets.

This improved tolerability is particularly important because sulfasalazine is often prescribed for long-term use. When patients experience fewer side effects, they are more likely to continue taking their medication as prescribed, leading to better treatment outcomes.

Medical Uses: Same Conditions, Same Effectiveness

Both regular Azulfidine and Azulfidine EN-Tabs are approved by the FDA for:

Ulcerative Colitis: Both formulations help reduce inflammation in the colon and maintain remission in patients with mild to moderate ulcerative colitis.

Azulfidine EN-Tabs are also approved for the following:

Rheumatoid Arthritis: As a DMARD, it helps slow disease progression and reduce joint inflammation in adults with rheumatoid arthritis who have not responded adequately to other treatments.

Polyarticular Juvenile Rheumatoid Arthritis: This is for pediatric patients who have responded inadequately to salicylates or other nonsteroidal anti-inflammatory drugs (NSAIDs).

How to Take Each Formulation

The administration instructions differ slightly between the two formulations due to the enteric coating:

Regular Azulfidine tablets: Can be taken with or without food, though taking them with food may help reduce stomach irritation. The tablets can be split if needed for dosing adjustments.

Azulfidine EN-Tabs: Must be swallowed whole and should not be cut, crushed, or chewed. Breaking the enteric coating would defeat its protective purpose. These tablets are typically taken in divided doses, preferably after meals.

Both formulations should be taken consistently at the same times each day to maintain steady levels of medication in your system. Your doctor will determine the appropriate starting dose and may gradually increase it based on your response and tolerance.

Side Effects: What to Expect

Common Side Effects

Both formulations can cause similar side effects since they contain the same active ingredient. However, stomach-related side effects are typically less frequent and less severe with EN-Tabs:

Common side effects that may occur with both formulations include headache, dizziness, and skin rash. Digestive symptoms like nausea, stomach upset, vomiting, and loss of appetite are more common with regular Azulfidine tablets.

Serious but Rare Side Effects

Regardless of formulation, sulfasalazine can cause serious side effects that require immediate medical attention. These include blood disorders, liver problems, severe allergic reactions, and lung inflammation. These serious effects are related to the active ingredient itself, not the coating.

Regular blood tests are typically recommended for patients taking either formulation to monitor for potential blood cell changes or liver function problems.

When Doctors Recommend the Switch

Healthcare providers often recommend switching from regular Azulfidine to Azulfidine EN-Tabs when patients experience stomach-related side effects that interfere with their ability to continue treatment. This switch allows patients to receive the same therapeutic benefits while experiencing better digestive tolerance.

The decision to use EN-Tabs versus regular tablets may also be made from the start of treatment in patients who have a history of stomach sensitivity or other risk factors for gastrointestinal side effects.

Some patients may also be prescribed EN-Tabs if they have difficulty maintaining consistent medication levels due to stomach upset affecting their ability to take doses regularly.

Cost Considerations and Availability

Both regular Azulfidine and Azulfidine EN-Tabs are available as brand-name medications. Generic versions of sulfasalazine are also available, which may be more affordable options.

Insurance coverage may vary between the different formulations. Some insurance plans may require patients to try regular sulfasalazine before approving coverage for the enteric-coated version, though this varies by plan.

For patients concerned about medication costs, exploring cash-pay options through Universal Drugstore can provide access to competitive pricing on both formulations. This can be particularly helpful when insurance coverage is limited or when patients are in Medicare coverage gaps.

Important Safety Information

Both formulations carry the same contraindications and warnings because they contain identical active ingredients. Patients should not take either form if they have:

Allergies to sulfonamides or salicylates, intestinal or urinary blockages, or certain blood disorders. Patients with kidney or liver disease may need dose adjustments or additional monitoring.

Both formulations can affect fertility in men by reducing sperm count, though this effect is typically reversible when the medication is discontinued. Patients planning to father children should discuss this with their healthcare provider.

Making the Right Choice for Your Treatment

The choice between regular Azulfidine and Azulfidine EN-Tabs should always be made in consultation with your healthcare provider. They will consider your medical history, current symptoms, previous experiences with similar medications, and individual risk factors.

If you are currently taking regular Azulfidine and experiencing stomach problems, do not switch to EN-Tabs on your own. Your doctor needs to evaluate whether the switch is appropriate and ensure proper dosing continuity.

Remember that both formulations are equally effective at treating the underlying inflammatory conditions. The primary advantage of EN-Tabs is improved stomach tolerability, which can lead to better long-term adherence to treatment and improved quality of life during therapy.

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