I took by mistake within half hour two 300 mg pills of Irbesartan?

Your bp may drop. That would mean dizziness and lightheadedness. Get up slowly. If you have a blood pressure cuff check it once and while throughout the day.

Just watch for anything unusual within yourself. You may be away from home but you can always talk with a pharmacist. Make sure you are drinking plenty of water. Get up slowly or move slowly in case of signs of lower blood pressure.

You didn't mention when you took this. You might want to keep a med journal... indicating the day, date and time you have taken your meds so that doesn't happen again. You can always talk with your doctor whether you are home or traveling. You can tell your doctor's office you are traveling and have to speak with him/her or a nurse.

Be safe, be well and be CAREFUL...

Mary