Mephnor Injection

Written By Dr. Mayank, Pharm.D

Reviewed By Dr. Rajeev Sharma, MBA, MBBS

Last updated on 22 Sep 2025 | 12:22 AM (IST)

Mephnor Injection is used to raise blood pressure in hypotensive (low blood pressure) states, such as following spinal anesthesia. It increases the blood pressure rapidly by increasing the pumping capacity of the heart and narrowing blood vessels of the heart.

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General Information

Contains

Mephentermine (30mg)

Marketer

Celon Laboratories Ltd

Storage

Store below 30°C

The content is shown in English

Product introduction

Mephnor Injection is administered under the supervision of a doctor. Your doctor will decide the dose and duration of the medicine for you. You should continue all your other medicines that are advised by the doctor for your long-term treatment even after this injection. Your doctor may advise for regular monitoring of blood pressure while your taking this medicine.

It may cause side effects like high blood pressure, anxiety and insomnia (difficulty in sleeping). This medicine may not be suitable for some people. You must inform doctor if you are suffering from diabetes, liver, heart or kidney disease. Also let your doctor know about all the other medications that you are using regularly. This medicine is not usually recommended during pregnancy or breastfeeding, so always consult your doctor before taking it.

Uses of Mephnor Injection

Decreased blood pressure

Benefits of Mephnor Injection

Decreased blood pressure
Low blood pressure (hypotension) can cause dizziness, fainting, blurred vision, and fatigue, especially during or after surgery or injury. Mephnor Injection helps raise and stabilize blood pressure, improving blood flow to vital organs. This reduces symptoms like weakness and lightheadedness, helping patients feel more alert and stable.

Side effects of Mephnor 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 Mephnor

Systemic hypertension (high blood pressure)
Anxiety
Insomnia (difficulty in sleeping)
CNS stimulation

How to use Mephnor Injection

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

How Mephnor Injection works

Mephnor Injection is a sympathomimetic medicine. It helps to release a chemical messenger (adrenaline), which constricts the blood vessels. It also promotes the heart’s contractile ability to pump more blood. Hence, it works to increase your blood pressure.

Quick tips

It is usually given as a slow injection into your veins by a doctor or healthcare professional.
Inform your doctor if you are pregnant, planning pregnancy or breastfeeding.
Inform your doctor if you are taking or have recently taken medication to treat severe depression.

Safety advice

Alcohol

CONSULT YOUR DOCTOR

It is not known whether it is safe to consume alcohol with Mephnor Injection. Please consult your doctor.

Pregnancy

CONSULT YOUR DOCTOR

Mephnor Injection may be unsafe to use during pregnancy. Although there are limited studies in humans, animal studies have shown harmful effects on the developing baby. Your doctor will weigh the benefits and any potential risks before prescribing it to you. Please consult your doctor.

Breast feeding

CONSULT YOUR DOCTOR

Information regarding the use of Mephnor Injection during breastfeeding is not available. Please consult your doctor.

Driving

CONSULT YOUR DOCTOR

It is not known whether Mephnor Injection alters the ability to drive. Do not drive if you experience any symptoms that affect your ability to concentrate and react.

Kidney

CONSULT YOUR DOCTOR

There is limited information available on the use of Mephnor Injection in patients with kidney disease. Please consult your doctor.

Liver

CONSULT YOUR DOCTOR

There is limited information available on the use of Mephnor Injection in patients with liver disease. Please consult your doctor.

Interaction with drugs

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

Life-threatening

Moclobemide (Oral Route)

Concurrent use may cause a severe or fatal increase in blood pressure.

Severe

Tranylcypromine (Oral Route)

Do not consume Tranylcypromine with Mephentermine. If Tranylcypromine is essential, ensure a gap of at least 2 weeks after discontinuing Mephentermine. Please consult your doctor.

Moderate

Selegiline (Oral Route)

Do not consume Selegiline with Mephentermine. If concurrent use is essential, your doctor may monitor your blood pressure frequently.

Moderate

Rasagiline (Oral Route)

If concurrent use is essential, your doctor may monitor your blood pressure frequently.

Moderate

Safinamide (Oral Route)

If concurrent use is essential, your doctor may monitor your blood pressure frequently.

Frequently asked questions

What is Mephnor Injection used for?

Mephnor Injection is used to treat low blood pressure, especially during surgery. It works by stimulating the heart and blood vessels to improve circulation and maintain blood pressure.

Who should not take Mephnor Injection?

Individuals should not take Mephnor Injection if they are allergic to mephentermine or any of its ingredients, or if they have certain heart conditions like severe high blood pressure, serious heart rhythm problems, or arterial narrowing.

Can Mephnor Injection be harmful for people with heart problems?

Yes, Mephnor Injection can be risky for people with heart disease, irregular heartbeats, or a history of heart attack. It can increase heart rate and blood pressure, which may worsen these conditions.

What precautions should I take before receiving Mephnor Injection?

Before receiving Mephnor Injection, inform your doctor if you have thyroid problems, diabetes, kidney disease, high blood pressure, or if you are taking other medicines for blood pressure or heart conditions.

Can Mephnor Injection cause a sudden increase in blood pressure?

Yes, Mephnor Injection can cause a sudden rise in blood pressure. Your doctor will monitor your blood pressure closely during and after treatment to ensure it stays within a safe range.

Is Mephnor Injection safe for elderly patients?

Elderly patients may be more sensitive to the effects of Mephnor Injection, particularly the increase in blood pressure and heart rate. Extra monitoring is often needed for safety.

Can Mephnor Injection affect heart rhythm?

Yes, Mephnor Injection can cause irregular heartbeats or worsen existing rhythm problems. If you feel palpitations, dizziness, or chest discomfort, tell your doctor immediately.

What are the serious side effects of Mephnor Injection?

Serious side effects of Mephnor Injection include chest pain, sudden severe headache, difficulty breathing, fainting, or a rapid, irregular heartbeat. Seek immediate medical attention if you experience any of these symptoms.

Fact Box

Chemical Class

Amphetamines Derivatives

Habit Forming

Yes

Therapeutic Class

CARDIAC

Action Class

Sympathomimetic Agents

References

Westfall TC, WestfallIn DP. Adrenergic Agonists and Antagonists. 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. p. 295.

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Disclaimer

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: Celon Laboratories Ltd
Address: Plot No 264, Patrika Nagar Madhapur, Hitech City Hyderabad, Telangana India - 500081

Vendor Details

Country of origin: India

Lab tests offered by us

Why we need a prescription?

Mephnor Injection

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General Information

Contains

Marketer

Storage

Product introduction

Uses of Mephnor Injection

Benefits of Mephnor Injection

Side effects of Mephnor Injection

How to use Mephnor Injection

How Mephnor Injection works

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Moclobemide (Oral Route)

Tranylcypromine (Oral Route)

Selegiline (Oral Route)

Rasagiline (Oral Route)

Safinamide (Oral Route)

Frequently asked questions

What is Mephnor Injection used for?

Who should not take Mephnor Injection?

Can Mephnor Injection be harmful for people with heart problems?

What precautions should I take before receiving Mephnor Injection?

Can Mephnor Injection cause a sudden increase in blood pressure?

Is Mephnor Injection safe for elderly patients?

Can Mephnor Injection affect heart rhythm?

What are the serious side effects of Mephnor Injection?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

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