Probably the same thing you do in the states if you have high blood pressure: make do with lesser medications, pain killers, lots of liquids, and push through it.
Warning: This is not medical advice, I am a nerd on the internet not a doctor
For what it is worth different countries have vastly different recommendations for HBP and these drugs. I recommend discussing with the pharmacists in your country.
In the US I have been told it's a strict "never", in Ireland I was told that it wouldn't have a measurable effect on blood pressure. I've also measured my personal blood pressure (pre-hypertension to stage 1) and have not been able to measure a difference in blood pressure.
For what it is worth different countries have vastly different recommendations for HBP and these drugs. I recommend discussing with the pharmacists in your country.
In the US I have been told it's a strict "never", in Ireland I was told that it wouldn't have a measurable effect on blood pressure. I've also measured my personal blood pressure (pre-hypertension to stage 1) and have not been able to measure a difference in blood pressure.