 <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]  any new spotting or breakthrough bleeding, because these may be signs that your birth control is not working well. Aprepitant is very similar to fosaprepitant. Do not use fosaprepitant while using aprepitant. Does Aprepitant interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Aprepitant Oral: 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.  Missed Dose It is important to take each dose of this medication as scheduled. If you miss a dose, ask your doctor or pharmacist right away for a new dosing schedule. Do not double the dose to catch up.  Storage Store the capsules at room temperature away from light and moisture. Store the liquid in the refrigerator and discard any unused liquid after 72 hours. Do not freeze. When ready to use, the liquid form of this medication may be stored at room temperature for up to 3 </s>