I started taking Doxycycline hyc 100mg tablet cit twice a day, 1 last night 9:00 pm another at 9:00 am this morning, every 12 hours for 30 days. Since I have a history of getting a yeast infection after taking an antibiotic, I have a prescription for 3 fluconazole tablets 150 mg. My question is, when should I begin taking the fluconazole tablets for 3 consecutive days? My doctor did say, but I don t remember. Thank you.