New doctor wants to cut my prescription in half?

[scubar]

My new VA doctor wants to change one of my blood pressure medications from 160 mg of Valsartan 2 times per day to an equivalent dose of 100 mg of Losartan but only once per day.  My blood pressure has been controlled for years with typical readings around 118/70 using the Valsartan, Amlodipine 5mg, and a diuretic (hydrochlorothiazide 25mg).  I have not made the change yet.

1. Why should I agree to experiment with reducing my primary blood pressure medication and what are the risks?
    His response was "let's see what happens".  
2. How long should it take before I see changes (if any) in typical blood pressure readings?

Thanks in advance for your inputs.

[kenkeith]

You may want to discuss the matter with an expert on the pharmacist.  The link is to your right and scroll down.  Your blood pressure appears to be properly managed and controlled so as you suggest it doesn't make much sense unless you are having side effects.  A risk of a larger dose vs. smaller dose may be the reason...less toxicity in the system.