High blood pressure medications works in different ways and can have an effect in different time periods. In general you should allow about 2 - 3 weeks to see a full effect from a medication. This full effect is not only what the medication does, but how your system reacts to the drug and adjusts to the changes.
If you are asking if its a physical or chemical change it would be physical.
No, a long as a dairy cow has been pregnant once, the cow will continue producing milk as long as it is continually milked whether it is currently pregnant or not
Answer:
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I think it would have to do with your circulation..? Decreased Circulation to be precise.