Depends: Propranolol will start to work within a couple of hours. It depends on what it has been prescribed for to realize the full effects. For example it will take about 2 weeks to determine if effective in treating hypertension (high blood pressure).
Answered 2/24/2018
4.1k views
Inderal (propranolol): Onset usually within one hour and can last up to 12 hours.
Answered 12/26/2018
4.1k views
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