Neo-Synephrine Side Effects
Generic Name: phenylephrine
Note: This page contains side effects data for the generic drug phenylephrine. It is possible that some of the dosage forms included below may not apply to the brand name Neo-Synephrine.
It is possible that some side effects of Neo-Synephrine may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.
For the Consumer
Applies to phenylephrine: intravenous solution
As well as its needed effects, phenylephrine (the active ingredient contained in Neo-Synephrine) may cause unwanted side effects that require medical attention.
If any of the following side effects occur while taking phenylephrine, check with your doctor or nurse immediately: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
If any of the following symptoms of overdose occur while taking phenylephrine, get emergency help immediately:Symptoms of overdose
- Feeling of fullness in the head
- pounding or rapid pulse
- tingling in the arms or legs
Some phenylephrine side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned 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
Nervous system side effects have included headache, dizziness, nervousness, restlessness, tremor, insomnia, convulsions, and central nervous system depression.[Ref]
Cardiovascular side effects have included palpitations, arrhythmias, and cardiovascular collapse with hypotension.[Ref]
Psychiatric side effects have included hallucinations, fear, and anxiety.[Ref]
Gastrointestinal side effects have included nausea.[Ref]
Respiratory side effects have included respiratory difficulty.[Ref]
Genitourinary side effects have included dysuria.[Ref]
General side effects have included pallor and weakness.[Ref]
1. "Product Information. Ah-Chew D (phenylephrine)." WE Pharmaceuticals Inc, Ramona, CA.
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