You will be alright if this is only a one time incidence.
The usual adult dose for lisinopril is 20 - 40 mg daily, so you are still within the normal dosing range. Please monitor and record your blood pressure daily. Watch for lower blood pressure effect, such as dizziness and tiredness.
I hope you resumed the 20 mg lisinopril dose at the same time in following day. It would be a good idea to inform your physician, just for their record. It is also a good idea to bring your home daily blood pressure log and medication list to share with your provider at every visit.
In addition, I'd like to recommend a pill box or a calendar to help you avoid future mixed-ups.
For more information on lisinopril and blood pressure medication management, please go to:
1. Lisinopril - Medline Plus
2. Tips to Help You Remember to Take Your Blood Pressure Drugs - National Heart, Lung, and Blood Institute or NHLBI
3. Treatment of High Blood Pressure - National Heart, Lung, and Blood Institute or NHLBI
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