20mg once a day would be the dose to try. I would think a one week trial would demonstrate if it were going to work. You might get a headache from it. It would only work if your problem were tied to a circulation issue. This drug dilates blood vessels. Since you have throbbing already, this might increase throbbing feelings.
I don't know if this dose of the drug is available in Canada.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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