Let's examine the options given:

• 'There is a notification requirement for medication which is sold over the counter if it is taken for a period exceeding 10 days.' → INCORRECT. There is not a general regulation that requires pilots to do so. Pilots must not take any medication that will affect their performance even if it is sold over the counter. What matters is the type of medication itself and not the period it is taken for.
• 'Generally both types of medication have to be handled in the same way' → CORRECT. Both prescription and over the counter medications can impair flight performance and should be treated with caution.
• 'Medication which is available over the counter is safe as long as a doctor has not expressed an opinion to the contrary.' → INCORRECT. Over the counter medications can cause side effects that impair a pilot's ability to operate an aircraft safely—even without a doctor's warning. Each individual reacts differently to each medication.
• 'Medication which is only available on prescription is considered to have an impact on flight performance only if explicitly noted on the package inser.' → INCORRECT. Some side effects may be under-reported or delayed, and individual responses can vary.