Isometheptene: Uses, Side Effects, and Safety
Isometheptene is a prescription decongestant that helps relieve stuffy nose and sinus congestion. It is sometimes used in combination products for headaches associated with congestion. It may cause serious effects in people with certain heart, blood pressure, eye, or prostate conditions.
Isometheptene can temporarily relieve congestion, but it may increase blood pressure or heart rate. Take it only as prescribed and ask a doctor or pharmacist whether it is safe for you.
Key facts at a glance
- ATC
- A03AX10
- RxNorm
- 27946
- Generic
- Isometheptene
- Class
- atc-a03
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- oral
- Forms
- capsule
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Dosage and administration
- Usual dose
- 500mg twice daily
- Maximum
- consult physician
- Frequency
- every 12 hours
- Instructions
- Follow physician instructions
- Duration limits
- as prescribed
- Monitoring
- standard
- Usual dose
- 250mg twice daily
- Maximum
- consult physician
- Frequency
- every 12 hours
- Instructions
- Follow physician instructions
- Duration limits
- as prescribed
- Monitoring
- standard
- Usual dose
- 400mg daily
- Maximum
- consult physician
- Frequency
- once daily
- Instructions
- Follow physician instructions
- Duration limits
- as prescribed
- Monitoring
- standard
Overdose information
Special Populations
10 groupspregnancy
first trimesteravoid if possible
avoid use during pregnancy unless benefits outweigh risks
regular fetal monitoring
Use of this medication in this population requires careful consideration of risks and benefits.
pregnancy
second trimesteravoid if possible
avoid use during pregnancy unless benefits outweigh risks
regular fetal monitoring and uterine blood flow assessment
Use of this medication in this population requires careful consideration of risks and benefits.
pregnancy
third trimesteravoid if possible
avoid use - may induce uterine contractions
fetal monitoring and uterine activity monitoring
Use of this medication in this population requires careful consideration of risks and benefits.
lactation
breastfeedingdiscontinue breastfeeding or avoid drug
isometheptene may pass into breast milk - avoid use while breastfeeding
monitor infant for adverse effects
Use of this medication in this population requires careful consideration of risks and benefits.
geriatric
elderlyreduce dose and increase monitoring interval
use with caution due to increased sensitivity to cardiovascular effects
monitor blood pressure and heart rate
Use with caution and monitor for adverse effects.
pediatric_age
children adolescentsavoid use in pediatric populations
not recommended for use in children under 12 years
not applicable - avoid use
Use of this medication in this population requires careful consideration of risks and benefits.
renal_impairment
mild renal impairmentno major dose adjustment needed but monitor
use with caution and monitor renal function
monitor renal function and for adverse effects
Use with caution and monitor for adverse effects.
renal_impairment
severe renal impairmentreduce dose or avoid
use with extreme caution or avoid in severe renal impairment
close monitoring of renal function and drug levels
Use with caution and monitor for adverse effects.
hepatic_impairment
mild hepatic impairmentuse with caution
use with caution and monitor liver function
monitor liver function tests
Use with caution and monitor for adverse effects.
hepatic_impairment
severe hepatic impairmentavoid use
avoid use in severe hepatic impairment
not applicable - avoid use
Use of this medication in this population requires careful consideration of risks and benefits.
Statistics and clinical data
Commonly prescribed since
General prescribing information for migraine treatment
Drug class
Pharmacological classification
Common uses
Primary therapeutic indications
Common formulations
Available dosage forms
Contraindications
Conditions and patient states where this medication should be avoided or used with caution.
Do not use (1)
Known allergy to this medication or its components
Use caution (1)
Consult healthcare provider for benefits vs risks assessment
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 24, 2026. · Read our editorial policy