Frenin Injection (Phenylephrine) | Used to Treat Low Blood Pressure

Precaution

1. High Blood Pressure

Tell your healthcare professional if you have hypertension. Phenylephrine can increase blood pressure, so careful monitoring may be required.

2. Heart Problems

Inform your doctor if you have heart disease, angina, heart failure, or other cardiovascular conditions. Excessive vasoconstriction can increase the workload on the heart.

3. Slow Heart Rate

Phenylephrine may cause bradycardia, particularly when blood pressure rises significantly. Heart rate should be monitored during administration.

4. Circulation Problems

Tell your healthcare professional if you have peripheral vascular disease or other circulation problems because excessive vasoconstriction may reduce blood flow to tissues.

5. Kidney Problems

Patients with kidney impairment may require careful monitoring. Phenylephrine labeling includes renal considerations and warns about possible renal toxicity.

6. Liver Problems

Inform your doctor if you have liver disease. Your clinical condition may affect how treatment is monitored.

7. Low Blood Volume

Before phenylephrine is administered, inadequate circulating blood volume should be corrected when appropriate because the response to the medicine can be affected by volume depletion.

8. Pregnancy and Breastfeeding

Tell your doctor if you are pregnant, planning pregnancy, or breastfeeding. Phenylephrine should be used when considered appropriate by a healthcare professional.

Usage

Frenin Injection should be used exactly as directed by the treating healthcare professional.

• The injection is administered by a qualified healthcare professional.
• The route and dose depend on the patient's condition and the formulation being used.
• Blood pressure and heart rate may be monitored during treatment.
• The dose may be adjusted according to the patient's blood-pressure response.
• Do not attempt to inject this medicine yourself.
• Do not use the injection if the solution appears unsuitable or has visible particles.
• The healthcare professional should follow the specific product instructions for preparation and administration.

Uses

1. Management of Low Blood Pressure

Frenin Injection may be used to help increase blood pressure when clinically significant hypotension occurs.

2. Hypotension During Anesthesia

Phenylephrine injection is indicated for clinically important hypotension resulting primarily from vasodilation in the setting of anesthesia.

3. Vasodilation-Related Hypotension

By constricting blood vessels, phenylephrine can help counteract excessive vasodilation and restore vascular tone.

4. Perioperative Blood Pressure Support

Phenylephrine may be used in monitored clinical settings around surgical procedures when blood pressure falls and pharmacological support is required.

Side Effects

Common Side Effects

Some patients may experience:

• Nausea
• Vomiting
• Headache
• Nervousness or restlessness
• Changes in blood pressure
• Slow heart rate

Product information for Frenin lists nausea, vomiting, and headache among commonly reported effects.

Serious Side Effects

Seek immediate medical attention for symptoms that may indicate:

• Severe or persistent high blood pressure
• Significant slowing of the heart rate
• Severe or irregular heartbeat
• Chest pain
• Reduced blood flow to tissues
• Severe circulation problems
• Significant tissue injury around the injection site
• Severe allergic reaction

FAQ

1. What is Frenin Injection?

Frenin Injection contains Phenylephrine and is used under medical supervision to help manage clinically significant low blood pressure.

2. What is the generic name of Frenin Injection?

The generic name is Phenylephrine.

3. What is Frenin Injection used for?

It is used to help increase blood pressure when clinically important hypotension occurs, particularly when associated with vasodilation during anesthesia.

4. How does Frenin Injection work?

It stimulates alpha-1 adrenergic receptors, causing blood vessels to constrict and increasing vascular resistance and blood pressure.

5. Can Frenin Injection be self-administered?

No. It should be administered by a qualified healthcare professional.

6. Can Frenin Injection cause high blood pressure?

Yes. Because phenylephrine raises vascular tone and blood pressure, excessive blood-pressure elevation can occur and should be monitored.

7. Can Frenin Injection affect heart rate?

Yes. Phenylephrine can cause slowing of the heart rate, particularly when blood pressure increases significantly.

8. What are the common side effects of Frenin Injection?

Commonly reported effects include nausea, vomiting, headache, and changes in blood pressure.

Interactions

1. Monoamine Oxidase Inhibitors (MAOIs)

MAOIs can increase the pressor effects of phenylephrine. Inform your doctor if you are taking or have recently taken an MAOI.

2. Tricyclic Antidepressants

Certain tricyclic antidepressants may increase the cardiovascular effects of phenylephrine.

3. Oxytocic Medicines

Oxytocic drugs may enhance the blood-pressure-raising effects of phenylephrine and require careful monitoring.

4. Alpha-Adrenergic Blockers

Alpha blockers can oppose the effects of phenylephrine and may reduce its blood-pressure response.

5. Beta Blockers

Beta-blocking medicines can alter the cardiovascular response to phenylephrine, particularly the heart-rate response.

6. ACE Inhibitors

ACE inhibitors may reduce the pressor response produced by phenylephrine.

7. Calcium Channel Blockers

Calcium channel blockers may affect the blood-pressure response to phenylephrine.

8. PDE-5 Inhibitors

Medicines used for erectile dysfunction, such as PDE-5 inhibitors, can oppose the pressor effect of phenylephrine.

9. Other Sympathomimetic Medicines

Other medicines that stimulate the sympathetic nervous system may increase cardiovascular effects when used with phenylephrine.