When used as treatment and prevention against malaria, Doxycycline should be taken two days before travelling for it to be in effect the moment you land in a foreign land. The drug should be taken everyday throughout your stay in that country for the efficacy to remain active. Learn more facts about this drug and the other disease it can treat by visiting http://www.netdoctor.co.uk/medicines/100002751.html.
Doxycycline is an antibiotic. It usually takes about three days for the medication to become effective in the bloodstream. Make sure you take the doses at the same time every day so that you can keep the level the same in the bloodstream and make sure you finish all the medication.
Results of using Doxycycline vary from person to person. Some people report seeing noticeable clearing within two days, while the average seems to be a week to two weeks for seeing substantial results. Regardless, the prescription should be taken until it's gone.