Description of selected adverse reactions* Reports of aseptic meningitis were predominantly in patients with underlying connective tissue disorders** A few very rare events of bleeding (e.g. skin, mucosa) have been reported in patients treated with Trental with and without anticoagulants or platelet aggregation inhibitors. The serious cases are predominantly concentrated in the gastrointestinal, genitourinary, multiple site and surgical wound areas and are associated with bleeding risk factors. A causal relationship between Trental therapy and bleeding has not been established. Thrombocytopenia has occurred in isolated cases.