Prescription onlyLower-cost generic availableClass: Respiratory



Prescription onlyLower-cost generic availableClass: Respiratory
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Makes it easier to breathe.

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Our bottom line

Brethine (Terbutaline) is effective at preventing asthma attacks, but isn’t the first choice. It’s generally well-tolerated, but let your doctor know if you feel more lightheaded or have a rapid heartbeat while taking this medicine.

Price and discounts
Best available price for 1 (1ml of 1mg/ml) vial of terbutaline


  • Brethine (Terbutaline) is effective at preventing and reversing constriction in the airways due to asthma, bronchitis, and emphysema.
  • Available in a generic form.
  • Good choice for asthma if you find it hard to use inhalers properly.


  • Only lasts about six hours.
  • Can raise your blood sugars. If you have diabetes, check your sugars regularly and let your doctor know if they’re higher than usual.
  • Takes about 30 to 45 minutes to start working, so it won’t help an asthma attack once it starts.
How it works

Brethine (Terbutaline) is a bronchodilator. It relaxes the muscles in your lungs to open airways and make breathing easier.

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Side effect rates for Brethine (terbutaline)

199 From clinical trials of Terbutaline / Bronchospasm with asthma
  • Nervousness
  • Tremor
  • Headache
  • Drowsiness
  • Heart pounding or racing sensation
  • Dizziness
  • Abnormally fast heart beat
  • Nausea
  • Extrasystoles ventricular
  • Dry mouth

Risks and Warnings for Brethine (terbutaline)

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  • Even though Brethine (Terbutaline) is used to treat asthma, sometimes it can actually make peoples’ airways more cramped, so it’s harder to breathe. If you're feeling short of breath and it's not going away, seek medical attention immediately.

Means that some groups have a high risk of experiencing this side effect

Common concerns from people taking Brethine (terbutaline)

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