What is the use of Rex Tablet? A Guide to Its Various Forms

October 6, 2025 •

3 min read

A study found that the name “Rex” is used by multiple pharmaceutical companies for a variety of medications across different countries, leading to potential confusion for consumers. As such, understanding what is the use of Rex Tablet requires identifying the specific product and its active ingredients before use.

Quick Summary

The name Rex Tablet applies to different medications from different manufacturers, so its use is not uniform. The specific drug's purpose varies widely, from treating allergic conditions and anxiety to managing bacterial infections, osteoarthritis, or providing cough relief.

Key Points

Multiple Medications, Same Brand Name: The name 'Rex Tablet' is not for a single drug, but a brand name used by different pharmaceutical companies for various products with unique uses.
For Allergies and Anxiety: A variant of Rex Tablet contains hydroxyzine, a first-generation antihistamine used to relieve skin allergies and manage anxiety due to its sedative effects.
For Bacterial Infections: Another form, Rex 150 MG, contains the antibiotic roxithromycin and is prescribed for respiratory, skin, and urinary tract bacterial infections.
For Cough and Congestion: A third combination product with guaifenesin, terbutaline, and bromhexine is used to treat cough with mucus and chest congestion.
For Osteoarthritis: Another distinct formulation with diacerein and glucosamine is used to manage the symptoms of osteoarthritis, such as joint pain and stiffness.
Always Confirm with a Professional: Given the variance, always confirm the active ingredients and intended use with a doctor or pharmacist before taking any medication labeled as 'Rex Tablet'.

The name 'Rex Tablet' is not a single medication but a brand name adopted by different manufacturers for products with distinct active ingredients and therapeutic purposes. For a patient, this means the use of 'Rex Tablet' can vary significantly depending on which specific product has been prescribed. To avoid confusion and ensure safety, it is crucial to identify the active ingredients listed on the packaging and consult a healthcare professional.

Common Uses for Medications Branded as Rex Tablet

Several different medical conditions are addressed by tablets sold under the Rex brand name. The most common varieties found in search results include treatments for allergies and anxiety, bacterial infections, chest congestion, and osteoarthritis. Each serves a different clinical purpose and works through a unique pharmacological mechanism.

Rex Tablet for Allergies and Anxiety (A Rex)

One common form of "Rex Tablet," often sold under the name "A Rex," contains the active ingredient hydroxyzine. Hydroxyzine is a first-generation antihistamine with sedative properties.

Relief from allergic conditions: This includes treating symptoms like itching, swelling, and rashes associated with conditions such as eczema, dermatitis, and psoriasis. Hydroxyzine works by blocking the action of histamine, a chemical responsible for these allergic symptoms.
Management of anxiety: Due to its calming and sedative effects, hydroxyzine is used to help manage excessive anxiety and worry.
Pre- and post-operative sedation: It can be used to induce relaxation and sleepiness in patients before and after surgery.

Rex Tablet for Bacterial Infections (Roxithromycin)

In some regions, a Rex Tablet may contain the macrolide antibiotic roxithromycin. This prescription-only medication is used to treat a variety of bacterial infections by stopping the growth of the bacteria.

Respiratory tract infections: This includes conditions like pharyngitis, tonsillitis, sinusitis, bronchitis, and pneumonia.
Skin and soft tissue infections: It is also used for bacterial infections affecting the skin and underlying tissues.
Urinary tract infections: In some cases, it can treat infections of the urinary tract.

Rex Tablet for Cough with Mucus (Multidrug)

Another formulation branded as Rex Tablet is a combination medicine containing guaifenesin, terbutaline, and bromhexine. This tablet targets respiratory symptoms involving mucus.

Cough relief: It helps to loosen and thin thick mucus in the lungs and airways, making it easier to cough up.
Bronchodilation: The terbutaline component helps to relax and widen the muscles in the airways, which can ease breathing.
Chest congestion: By reducing the stickiness of mucus, it provides relief from chest congestion caused by infections, allergies, and the common cold.

Rex Tablet for Osteoarthritis (Diacerein, Glucosamine)

A different combination product containing diacerein and glucosamine is used to treat osteoarthritis.

Osteoarthritis management: It helps to reduce the pain, swelling, and stiffness associated with this degenerative joint condition.
Cartilage formation: The components aid in the formation of cartilage, which cushions the joints, and improve joint flexibility.

Comparison of Different Rex Tablet Formulations

The table below outlines the key differences between some of the distinct medications that share the name "Rex Tablet." This highlights why it is critical to confirm the active ingredients before use.


Feature	A Rex Tablet (Hydroxyzine)	Rex Tablet (Cough combo)	Rex 150 MG Tablet (Roxithromycin)	Rex 50mg/500mg Tablet (Diacerein/Glucosamine)
Primary Use	Allergies, Anxiety	Cough with mucus, Chest congestion	Bacterial infections (respiratory, skin, UTI)	Osteoarthritis, Joint pain
Active Ingredients	Hydroxyzine	Guaifenesin, Terbutaline, Bromhexine	Roxithromycin	Diacerein, Glucosamine
Classification	Antihistamine (First-gen)	Expectorant, Bronchodilator, Mucolytic	Macrolide Antibiotic	Disease-modifying anti-osteoarthritis drug
Side Effects	Drowsiness, dry mouth, dizziness, blurred vision	Nausea, diarrhea, headache, tremors, increased heart rate	Diarrhea, stomach pain, headache, nausea, vomiting	Nausea, diarrhea, constipation, heartburn, urine discoloration
Key Precautions	Avoid alcohol and driving, use caution with heart problems	Caution for heart/thyroid disease, avoid driving if sleepy	Finish full course, caution for liver problems or heart rhythm issues	May take weeks for benefits, monitor blood sugar if diabetic
Prescription?	Yes	Yes	Yes	Yes

Conclusion

In summary, there is no single answer to the question "What is the use of Rex Tablet?" due to multiple medications sharing this brand name. The function of the tablet depends entirely on its active ingredients, which can range from an antibiotic like roxithromycin to an antihistamine like hydroxyzine, a cough remedy, or an osteoarthritis treatment. It is imperative for patients to verify the specific medication prescribed to them by checking the drug's composition. Always consult with a doctor or pharmacist to confirm the correct product and its intended use, dosage, and potential side effects to ensure safe and effective treatment.

Frequently Asked Questions

The specific use depends on the formulation. A Rex Tablet typically contains the antihistamine hydroxyzine for allergies and anxiety, whereas other tablets branded as Rex might be antibiotics, cough medicine, or arthritis treatments.

Yes, but only the specific version containing the active ingredient roxithromycin. It is a prescription antibiotic used for a range of infections, including those affecting the respiratory tract, skin, and urinary tract.

Yes, a combination product branded as Rex Tablet, containing guaifenesin, terbutaline, and bromhexine, is used to relieve cough with mucus and chest congestion.

Yes, a formulation containing diacerein and glucosamine is prescribed to treat the symptoms of osteoarthritis, such as joint pain and inflammation.

Side effects for the hydroxyzine-containing A Rex Tablet commonly include drowsiness, dizziness, blurred vision, dry mouth, and constipation.

It depends on the specific formulation. The roxithromycin-based Rex 150 MG tablet should be taken on an empty stomach, while the cough and arthritis formulations may be taken with or without food.

The brand name 'Rex' is used by various pharmaceutical companies in different countries for unrelated products. This common practice in the industry means that the name alone is not enough to identify a medication's purpose.

The safety varies by product. For instance, the roxithromycin version is generally considered safe during pregnancy but requires consultation. Other versions, like the hydroxyzine tablets, may have contraindications. Always consult a doctor.

Due to the sedative effects of formulations like A Rex Tablet (hydroxyzine) and the potential for dizziness with others, it is generally advised to avoid driving or operating machinery until you know how the specific medication affects you.

If you are unsure about your prescription, do not take the medication. Instead, contact your doctor or pharmacist immediately to clarify the correct product, its intended use, and dosage.