Relasmin Injection

Reviewed By Dr. Rajeev Sharma, MBA, MBBS

Last updated on 31 Mar 2026 | 02:32 PM (IST)

Relasmin Injection is used to treat and prevent symptoms of asthma and chronic obstructive pulmonary disorder (a lung disorder in which flow of air to the lung is blocked). It helps in relaxing the muscles of the air passages, thus widening it and making it easier to breathe.

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General Information

Contains

Theophylline (84.7mg)

Marketer

Tablets India Limited

Storage

Store below 30°C

The content is shown in English

Product introduction

Relasmin Injection is given as an injection into the vein by a doctor. The dose and how often you take it depends on what you are taking it for. Your doctor will decide how much you need to improve your symptoms. Get the injection for as long as it is prescribed to you. Your doctor may get regular blood tests to check for medicine levels in the blood.

The most common side effects of this medicine include chest pain and discomfort, dizziness, fainting, rash or itching, swelling of the face, breathing difficulties, headache, and nausea. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. Generally, it is advised not to consume alcohol or do not smoke while on treatment. You must avoid high caffeinated products like coffee, tea, and dark chocolates as it enhances drug side effects.

Before taking this medicine, let your doctor if you have kidney or liver disease or if you have heart-related problems. Your doctor should also know about all other medicines you are taking as many of these may make this medicine less effective or change the way it works. Inform your doctor if you are pregnant or breastfeeding before starting the treatment.

Uses of Relasmin Injection

Benefits of Relasmin Injection

Asthma
Asthma is a condition where the airways become inflamed and narrowed, causing difficulty in breathing, coughing, and wheezing. Relasmin Injection helps relax and open up the airways by reducing inflammation and easing the tightening of airway muscles. This makes breathing easier and helps control asthma symptoms.

Chronic obstructive pulmonary disease (COPD)
Chronic obstructive pulmonary disease (COPD) is a long-term lung disease that causes airflow blockage and breathing problems. Relasmin Injection works by widening the air passages and improving airflow to the lungs. It helps reduce shortness of breath, improves lung function, and enhances the ability to carry out daily activities.

Side effects of Relasmin Injection

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them

Common side effects of Relasmin

Chest pain
Dizziness
Fainting
Itching
Headache
Nausea
Rash
Swelling

How to use Relasmin Injection

Your doctor or nurse will give you this medicine. Kindly do not self administer.

How Relasmin Injection works

Relasmin Injection is a bronchodilator. It works by relaxing the muscles of the airways and widens airways. This makes breathing easier.

Quick tips

You have been prescribed Relasmin Injection for prevention and treatment of asthma and chronic obstructive pulmonary disease (COPD).
It is injected into the veins under the supervision of a medical professional.
It does not work right away and should not be used to relieve sudden breathing problems. Always keep a fast-acting (rescue) inhaler with you.
Your doctor may take regular blood test to monitor potassium level and the level of this medicine in your body.
Notify your doctor if you have ever been diagnosed with kidney, liver or heart disease, or if you have a smoking history. Your dose may need to be adjusted.
Do not discontinue use without consulting your doctor, even if you feel better.

Safety advice

Alcohol

UNSAFE

Do not drink alcohol while you are taking this medicine. Relasmin Injection may cause excessive drowsiness when taken with alcohol.

Pregnancy

CONSULT YOUR DOCTOR

Relasmin Injection is not recommended during pregnancy as there is positive evidence of fetal risk based on animal studies. However, it may still be prescribed by a doctor in situations where the benefits outweigh the risks.

Breast feeding

SAFE IF PRESCRIBED

Available human data suggest that the drug does not pass into breast milk in clinically significant amounts and is unlikely to harm the infant.
Avoiding breastfeeding for 2-4 hours after Relasmin Injection can further decrease the exposure of medicine to the baby.

Driving

NOT RELEVANT

Not relevant, as Relasmin Injection is intended for use in hospitalized patients.

Kidney

CAUTION

Relasmin Injection should be used with caution in patients with kidney disease. Dose adjustment may be needed.

Liver

CAUTION

Relasmin Injection should be used with caution in patients with severe liver disease. Dose adjustment may be needed.

Interaction with drugs

Taking Relasmin with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Life-threatening

Carvedilol (Oral Route)

Do not use Carvedilol with Theophylline in any form if you have asthma or breathing issues, as it may result in excessive breathlessness or coughing.

Life-threatening

Labetalol (Injection Route)

Do not use Labetalol with Theophylline in any form if you have asthma or breathing issues, as it may result in excessive breathlessness or coughing.

Life-threatening

Labetalol (Oral Route)

Do not use Labetalol with Theophylline in any form if you have asthma or breathing issues, as it may result in excessive breathlessness or coughing.

Life-threatening

Pindolol (Oral Route)

Do not use Pindolol with Theophylline in any form if you have asthma or breathing issues, as it may result in excessive breathlessness or coughing.

Life-threatening

Propranolol (Oral Route)

Do not use Propranolol with Theophylline in any form if you have asthma or breathing issues, as it may result in excessive breathlessness or coughing.

Frequently asked questions

Is Relasmin Injection a steroid?

No, Relasmin Injection is not a steroid. It is a methylxanthine drug which relaxes smooth muscles around the airways of the lungs. It belongs to bronchodilator group of medicines. It relaxes the air passages in the lungs making it easier to breathe.

Does Relasmin Injection cause tachycardia?

Yes, Relasmin Injection may cause increased or rapid heart rate (tachycardia). It may also cause irregular heart beat, palpitations, and low blood pressure. Immediately contact the doctor if you experience any of these symptoms. It is important to inform your doctor if you are a heart patient, as regular check on heart rate and blood pressure may be advised.

Is Relasmin Injection a stimulant?

Yes, Relasmin Injection is a central nervous system stimulant. During treatment with Relasmin Injection, the patient may experience headache, irritability, and sleeplessness, or inability to fall asleep (insomnia), lightheadedness, and dizziness. Discuss with your doctor if you notice any of these symptoms.

Fact Box

Chemical Class

Xanthine derivative

Habit Forming

Therapeutic Class

RESPIRATORY

Action Class

Xanthine Derivatives- Respiratory

Related lab tests

Absolute Eosinophil Count

Complete Blood Count

References

Barnes PJ. Pulmonary Pharmacology. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s: The Pharmacological Basis of Therapeutics. 12th ed. New York, New York: McGraw-Hill Medical; 2011. pp. 1040-44.
Boushey HA. Drugs Used in Asthma. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. p. 345.
Briggs GG, Freeman RK, editors. A Reference Guide to Fetal and Neonatal Risk: Drugs in Pregnancy and Lactation. 10th ed. Philadelphia, PA: Wolters Kluwer Health; 2015. pp. 1350-51.
Theophylline. Lake Forest, IL: Hospira, Inc.; 2008. [Accessed on 1 Apr. 2019] (online) Available from:
Chaves RG, Lamounier JA. Breastfeeding and maternal medications. J Pediatr (Rio J). 2004;80(5 Suppl):S189-S198. [Accessed 01 Apr. 2019] (online) Available from:
Central Drugs Standard Control Organisation (CDSCO). [Accessed 01 Apr. 2019] (online) Available from:
Theophylline [Prescribing Information]. Bethlehem, PA: B. Braun Medical Inc.; 2016. [Accessed 07 Aug. 2023]. (online) Available from:

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Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Tablets India Limited
Address: Tablets (India) Limited, “Jhaver Centre”, 72 Marshalls Road, Chennai 600 008.

Vendor Details

Country of origin: India

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Why we need a prescription?

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Most medicines cannot be sold without a valid prescription, as per the Drugs and Cosmetics Act, 1940 and Rules, 1945

Relasmin Injection

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General Information

Contains

Marketer

Storage

Product introduction

Uses of Relasmin Injection

Benefits of Relasmin Injection

Side effects of Relasmin Injection

How to use Relasmin Injection

How Relasmin Injection works

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Carvedilol (Oral Route)

Labetalol (Injection Route)

Labetalol (Oral Route)

Pindolol (Oral Route)

Propranolol (Oral Route)

Frequently asked questions

Is Relasmin Injection a steroid?

Does Relasmin Injection cause tachycardia?

Is Relasmin Injection a stimulant?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

Related lab tests

Absolute Eosinophil Count

Complete Blood Count

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

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