often causes headaches
. Most antibiotics can cause changes in bowel movements. If this all started with taking the minocycline, you may need to stop the medicine. Drinking more water and taking fiber supplements may help with the stool problem. The stool problems may be from something else, but first I suggest you stop the minocycline and see if they clear up. If they don't, you will need to have further testing to see what is causing this. Talk to your doctor about stopping the minocycline and see if the symptoms go away first.
Hope I have answered your query. If you have any further questions I will be happy to help.