Thank you for your query at DoctorSpring.com
Can you mention the dose that you're taking? And also what exactly is the cause of your lack of sleep? Panadol is not indicated for insomnia normally, it acts more like an analgesic. The dose limit is 2 g, you should not exceed that limit in one day. However long term use of low dose panadol can lead to liver toxicity.
Can you also give me a detailed medical history? Any history of chronic pain anywhere?
The only way to prevent toxicity is not to exceed the daily limit, and have the medicine after meals. If taken in empty stomach it can cause gastric upset. If this phase is temporary and you discontinue the medicine after a few weeks, then it won't harm your liver in any way, provided you do not exceed the limit.
Feel free to discuss further,