 <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] . Do not start, stop, or change the dosage of any medicines without your doctor's approval. Some products that may interact with this drug include: anti-seizure medications (such as phenytoin), retinoid medications taken by mouth (such as acitretin, isotretinoin), digoxin, phenobarbital, warfarin. This medication may interfere with certain lab tests (such as some urine tests for sugar), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug. Does Doxycycline Hyclate Vial interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Doxycycline Hyclate 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 With long-term use, lab and/or medical tests (such as complete blood count, kidney/liver function) should be done while you are using this medication. </s>