Hello, i farmed a paddy field so i took 2 doxycycline tablets for leptospirosis before farming and another 4 tablets after farming within 2 days. it is necessary to take this medicine for a week or taking only 2 pills before farming is enough?

You are on track with your prophylaxis regime, it will certainly prevent you for becoming sick and from shedding the spirochetes in your urine. Here is an article that will help you decide: https://www.uptodate.com/contents/leptospirosis-treatment-and-prevention/print - I am always uncomfortable about repeated exposure to valuable antibiotics - you might be completely resistant to the bug already