On this page · 9 sections

Immphentiv (injection)

Generic name: phenylephrine (injection)

Brand names: Biorphen, Immphentiv, Neo-Synephrine, Vazculep

Last updated November 2, 2026 0 views
Share

What is Immphentiv?

Immphentiv is used to increase blood pressure in adults who have life-threatening low blood pressure due to septic shock or due to anesthesia during surgery or a procedure.

Immphentiv may also be used for reasons not mentioned in this medication guide.

This section was rewritten for readability and reviewed for meaning.

Warnings

Use only as directed. Inform your doctor if you are taking other medicines or have other medical conditions or allergies.

This section was rewritten for readability and reviewed for meaning.

Before taking this medicine

You should not be treated with Immphentiv if you are allergic to it.

Tell your doctor if you have or have ever had:

  • heart problems including chest pain or coronary artery disease (clogged arteries);
  • pulmonary arterial hypertension;
  • blood circulation problems;
  • a history of a condition called autonomic dysfunction (which can happen with spinal cord injury);
  • asthma or sulfite allergy;
  • if you use a medicine that causes contractions of the uterus in a woman;
  • fluid in the lungs; or
  • liver or kidney disease.

It is not known if Immphentiv will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Ask a doctor if it is safe to breastfeed while using Immphentiv.

In an emergency, you may not be able to inform your medical caregivers about your medical conditions or if you are pregnant or breastfeeding. Make sure any follow-up doctor knows you received this medicine.

This section was rewritten for readability and reviewed for meaning.

Immphentiv side effects

Get emergency medical help if you have signs of an allergic reaction: hives, trouble breathing, swelling of your face, lips, tongue, or throat.

Tell your medical caregivers right away if you have:

  • pale skin, severe shortness of breath, wheezing, cough with foamy mucus;
  • fast, slow, or uneven heart rate;
  • severe headache, blurred vision, pounding in your neck or ears;
  • chest pain or pressure, pain spreading to your jaw or shoulder, nausea;
  • pain, burning, irritation, or skin changes where the injection was given;
  • numbness, tingling, burning pain in your hands or feet;
  • dizziness;
  • tremors;
  • sweating or flushing (sudden warmth, redness, or tingly feeling); or
  • kidney problems--swelling, urinating less, feeling tired or short of breath.

Common side effects of Immphentiv may include:

  • headache;
  • feeling nervous or excited; or
  • nausea or vomiting.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

This section was rewritten for readability and reviewed for meaning.

How is Immphentiv given?

Immphentiv is injected into a vein by a healthcare provider.

You will need frequent medical tests. Your heart rate and blood pressure will be constantly monitored and your kidney function may need to be checked often.

Tell your medical caregivers if you feel any burning or pain when Immphentiv is injected.

What happens if I miss a dose?

In an emergency medical setting, you are unlikely to miss a dose.

This section was rewritten for readability and reviewed for meaning.

What happens if I overdose?

In a medical setting, an overdose will be treated promptly.

Follow your doctor's instructions regarding any limits on food, drinks, or activities.

This section was rewritten for readability and reviewed for meaning.

What other drugs will affect Immphentiv?

Many drugs can interact with Immphentiv. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are mentioned here. Inform your doctor about all other medicines you are taking.

This section was rewritten for readability and reviewed for meaning.

Common questions about phenylephrine

Phenylephrine vs Pseudoephedrine - How do they compare?
The most important difference between phenylephrine (PE) and pseudoephedrine is that phenylephrine is ineffective at relieving nasal congestion, whereas there is some evidence that oral pseudoephedrine is effective. Continue reading
Does Mucinex help with Covid?
Mucinex does not prevent or cure COVID‑19, but it can help some people feel better by easing symptoms like chest congestion and cough. It should be used only for symptom relief and never as a substitute for COVID‑19–specific treatments, such as antivirals prescribed by your doctor. Continue reading

Related medicines

Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
General medicine information Consumer-friendly language

Content is provided for education and is not medical advice. See our medical disclaimer.