Is It Safe To Take Metroplast, Vertizen, And Vitaseng Without A Confirmed Diagnosis?

My MIL is having headache on and off for past 2 months accompanied with dizziness .also neck pain. Doctor has suggested below medicines Metroplast Vertizen 16 mg Vitaseng 6 g. When checked in Google usage is for different disease .can we take these tablets without knowing what is the health issue ? Doctor has asked to take blood test , but tablets are provided before that