There is also a standard terminology for undesirable effects of medications: - Very common: affects more than 1 in 10 people – ie the risk is 10% or higher -

There is also a standard terminology for undesirable effects of medications: - Very common: affects more than 1 in 10 people – ie the risk is 10% or higher - Common: affects between 1 in 100 and 1 in 10 people – ie risk is 1% to 10% - Uncommon: affects between 1 in 1,000 and 1 in 100 people – ie risk is 0.1% to 1% - Rare: affects between 1 in 10,000 and 1 in 1,000 people – ie risk is 0.01% to 0.1% -Very rare: affects less than 1 in 10,000 people – ie risk is less than 0.01% (This includes isolated reports)