 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your birth control is not working well. This medication may interfere with certain lab tests (such as urine screening for opiates, blood serum folate/vitamin B12), possibly causing false test results. Rifampin may also make it harder for your body to get rid of certain chemicals used in gallbladder tests. Make sure lab personnel and all your doctors know you use this drug. Does Rifadin 600 Mg Intravenous Solution Rifamycins interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Rifadin Intravenous: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.  Notes Do not share this medication with others. Lab and/or medical tests (such as liver/kidney function, bilirubin, complete blood count) may be done before you start using this medication and while you are using it </s>