I’m taking it for one week two times daily to treat an STI. Ever since my boyfriend and I have started taking it, we’ve had head aches, very sore and swollen throats, coughing, runny/stuffy noses, watery eyes, sneezing. Is this a coincidence, or does this commonly happen while taking doxycycline?

Also, do you think I will be able to take some sort of medication while I am on this pill? Or should I just wait it out in case it lowers the effectiveness?