No, they will be written in a way that patients can understand SDTG.
For example, the PIL for Ventolin says this:
Common (may affect up to 1 in 10 people)
feeling shaky
headache.
Uncommon (may affect up to 1 in 100 people)
mouth and throat irritation
muscle cramps.
Rare (may affect up to 1 in 1,000 people)
a low level of potassium in your blood
increased blood flow to your extremities (peripheral dilatation).
Very rare (may affect up to 1 in 10,000 people)
changes in sleep patterns and changes in behaviour, such as restlessness and excitability.
The following side effects can also happen but the frequency of these are not known:
chest pain, due to heart problems such as angina. Tell your doctor, nurse or pharmacist if this occurs. Do not stop using this medicine unless told to do so.
Copy and paste from the BNF without explanation of the terminology or relative risk is not helpful.
I did state clearly that sharing medication is never a good idea.