 <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]  the labels of all your medications to make sure you are not taking more than one product containing guaifenesin or phenylephrine. Guaifenesin may interfere with certain lab tests (such as urine levels of certain acids), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug. Does Fenesin PE IR interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Fenesin PE IR 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. Symptoms of overdose may include: severe dizziness/fainting, fast irregular heartbeat, slow/fast/shallow breathing, hallucinations, seizures.  Notes If your doctor prescribed this medication, do not share this medication with others. Keep all medical and lab appointments. This medication is for temporary use only. Do not take this medication for more than 7 days unless your doctor tells you to do so. Tell your doctor if your condition lasts longer than 7 </s>