 <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]  you to take low-dose aspirin for heart attack or stroke prevention (usually 81-162 milligrams a day), you should continue taking it unless your doctor instructs you otherwise. Discuss the risks and benefits with your doctor. This product may decrease the effectiveness of hormonal birth control such as pills, patch, or ring. This could cause pregnancy. Discuss with your doctor or pharmacist if you should use additional reliable birth control methods while using this product. Also tell your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your birth control is not working well. The interactions listed above are not a complete listing of all possible drug interactions. St. John's wort can interact with many medications and products. It may also speed up the removal of other medications from your body, which may affect how they work. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first. Does St. John's Wort interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of St. John'S Wort Oral: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call </s>