Using beta blockers and antacids is not recommended now in PPH. Using antacids is not recommended bc your gastric HCL reacts with SN and gives nitric oxide which acts as a vasodilator.
3NaNO
2 +
2HCl →
2NO + H
2O + NaNO
3 +
2NaCl
Nitric oxide causes vasodilation which in turn lowers your blood pressure making you more likely to lose consciousness more quickly and depriving your tissues from blood and oxygen ( Hypemic hypoxia ).
As regard to beta blockers, they lower your fast heart rate (tachycardia) which is just a symptom. You might find tachycardia a bit distressful but tachycardia will likely make your death come sooner. Your heart as it beats faster ( to supply your brain with oxygen and nutrients ) , requires more blood and oxygen to bump more thus potentiating the hypemic hypoxia by taking more oxygen, making it more likely to cause anemic heart failure ( Your heart won't beat anymore bc it is exhausted ) or loss of consciousness due to cerebral hypoxia.
You can take the beta blockers ofc if you find that tachycardia will be distressful for you but keep in mind that it makes your time to ctb more longer.
https://cdn8.bunkr.ru/162454_162400...cjke_and_Fiona_Stewart_z-lib.org-9ECfmInr.pdf
Read page 115 and 116