Thanks for your query.
Ranolaz is a medicine used for chronic anginal pains so you should take it as your doctor has prescribed.
It has side effect of constpation which can be managed by taking a high fiber diet and plenty of liquids.
In case you are hesitant to take it please consult your doctor and get an alternative medication prescribed.
As for the other medicines clodrel 75 and clopflow 75 both are one and the same as their content is clopidogrel
and they are brand names of different companies.
So as both are same you can choose any of it but you should take it only when your doctor has prescribed.