Neo-Synephrine Side Effects
Generic Name: phenylephrine
Medically reviewed by Drugs.com. Last updated on Nov 14, 2020.
Note: This document contains side effect information about phenylephrine. Some of the dosage forms listed on this page may not apply to the brand name Neo-Synephrine.
For the Consumer
Applies to phenylephrine: intravenous solution
Side effects requiring immediate medical attention
Along with its needed effects, phenylephrine (the active ingredient contained in Neo-Synephrine) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor or nurse immediately if any of the following side effects occur while taking phenylephrine:
Incidence not known
- Blurred vision
- chest pain or discomfort
- difficult or labored breathing
- fast, slow, or irregular heartbeat
- nausea or vomiting
- pain in the shoulders, arms, jaw, or neck
- pounding in the ears
- tightness in the chest
- unusual tiredness
Get emergency help immediately if any of the following symptoms of overdose occur while taking phenylephrine:
Symptoms of overdose
- Feeling of fullness in the head
- pounding or rapid pulse
- tingling in the arms or legs
Side effects not requiring immediate medical attention
Some side effects of phenylephrine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.
Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Incidence not known
- itching skin
- pain in the neck
- pain or discomfort in chest, upper stomach, or throat
For Healthcare Professionals
Applies to phenylephrine: compounding powder, injectable solution, intravenous solution, oral disintegrating strip, oral liquid, oral suspension extended release, oral tablet, oral tablet chewable, oral tablet chewable extended release, oral tablet disintegrating
Frequency not reported: Headache, paresthesia, tremor[Ref]
Frequency not reported: Nervousness, excitability[Ref]
Frequency not reported: Nausea, vomiting[Ref]
Frequency not reported: Extravasation[Ref]
Frequency not reported: Sulfite sensitivity[Ref]
Frequency not reported: Chest pain[Ref]
Frequency not reported: Diaphoresis, pallor, piloerection, skin blanching, skin necrosis with extravasation[Ref]
1. "Product Information. Phenylephrine Hydrochloride (phenylephrine)." Cipla USA Inc., Miami, FL.
Frequently asked questions
More about Neo-Synephrine (phenylephrine)
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Interactions
- Drug class: decongestants
- Latest FDA Alerts (2)
Related treatment guides
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Some side effects may not be reported. You may report them to the FDA.