On monday I woke up with a mild sore throat and didn't think too much about it. I was seeing the doctor monday evening to change my acne medication to minocycline. I took my first minocycline MR 100mg capsule on monday evening. Ever since then I have woke up feeling run down with a sore throat. It gets slightly better during the day but feels like I have mild flu. Could a side-effect like this develop quickly with the medication, or do I have a flu or cold? As I had a mild sore throat before taking the medication.