I don't know a lot about this but I do know that when I worked in ICU at the hospital that sometimes when a patient was changed from a tablet to a liquid form of the same dose the pharmacist would change the amount of liquid. For example 10mg of some thing the dose in liquid form might be 5mg per 2 mls, so then you would take 4mls to get the same dose in theory. The pharmacist would change the amount of liquid to be given to get the same dose in liquid form. It never really make sense to me...if something is 5mg/2mls it should be 5mg/2mls!
I think it has something to do with how the body absorbs the liquid differently to a tablet and maybe an adjusted amount was needed to get the same levels of the medication into the system in liquid form.
Maybe your body just needs time to adjust to the change? I don't know if this makes any sense?