How long can I take Fampyra?

I'm curious to know, how long can one safely take Fampyra? Is there a recommended duration of use, or is it a medication that can be taken indefinitely under certain circumstances? Are there any potential side effects or risks associated with long-term use that patients should be aware of? Additionally, are there any factors that might influence the duration of treatment, such as the severity of the condition being treated or the individual's response to the medication?