Within the system organ classes, adverse reactions are listed under headings of frequency (number of patients expected to experience the reaction), using the following categories: very common (≥ 1/ 10); common (≥ 1/ 100, < 1/ 10); uncommon (≥ 1/ 1,000, < 1/ 100); rare (≥ 1/ 10,000, < 1/ 1,000); very rare (< 1/ 10,000); not known (cannot be estimated form the available data)..