Classification of dermal sensitizers in pharmaceutical manufacturing.

Workers in development and manufacturing of pharmaceuticals are at risk for occupational contact dermatitis (OCD) of irritative (ICD) or allergic (ACD) origin, due to contacts with reactive intermediates (IM) and drug substances (DS). We examined, if alternative methods could replace presently used animal tests for identification of ACD in pharmaceutical development and manufacturing, without apparent loss of worker health, in line with regulations. The status of alternative methods for regulatory toxicology for consumer products has recently been reviewed by the Organisation for Economic Co-operation and Development (OECD) and the European Commission's Joint Research Center (JRC) for the European Chemicals Agency (ECHA). They concluded that prediction of skin sensitization potential, extent and quality by in vitro methods, for regulatory assessments, will depend on the regulatory purpose and level of confidence required. Some alternative methods are currently in validation. Current Globally Harmonized System (GHS) regulations on classification, labeling and packaging of substances and mixtures depend on human and animal data, whereas alternative methods may provide supportive evidence. Since the levels of workplace skin exposure to DS and IM in manufacturing of pharmaceuticals are usually not known, it is not possible to conduct quantitative risk assessments based on threshold calculations for contact sensitizers.

Cancer risk of immunosuppressants in manufacturing.

During the chemical and pharmaceutical production of active pharmaceutical substances which are intended for immunosuppressive therapy, the employees may be exposed to these substances via inhalation. Immunosuppressants are linked to development of certain types of cancers e.g., lymphoma or skin cancer in transplant patients. The development of these cancers in patients is linked to the level of immunosuppression needed for transplantation in order to avoid organ rejection. Below these levels, with the immune system functioning uninhibited, cancer is unlikely to develop. An internal workshop was conducted to compare several pharmaceutical substances with the intrinsic property to cause immunosuppression, with the attempt to define the risk of healthy employees to develop cancer due to exposure to immunosuppressive substance at work and to determine the appropriate hazard classification for regulatory purposes. Data are discussed with emphasis on cyclosporine to reason the dose-response relationship and the safe level for occupational exposure. Our review indicates that if the exposure to cyclosporine at the workplace is below the threshold necessary to induce immunosuppression, the risk to develop cancer is negligible. Non-mutagenic immunosuppressants do not contribute to malignancies in occupational setting if their air concentrations do not exceed the immunosuppressive threshold limited with occupational exposure limits (OELs), which is for cyclosporine 17.5µg/m(3).

Human health risk assessment of carbamazepine in surface waters of North America and Europe.

A human health risk assessment was carried out for environmental exposures to carbamazepine (CBZ) and its major human metabolites, carbamazepine diol (CBZ-DiOH) and carbamazepine N-glucuronide (CBZ-N-Glu). Carbamazepine is an active pharmaceutical ingredient (API) used worldwide as a medicine for treating epileptic seizures and trigeminal neuralgia. Carbamazepine tends to be detected in surface water more frequently, and at relatively higher concentrations, than most other APIs. Predicted no effect levels (PNECs) for CBZ and its major human metabolites were developed for surface waters to be protective of human health from environmental exposures from drinking water and fish consumption. These PNECs were compared to both measured (MEC) and predicted (PEC) environmental concentrations for North America and Europe. PECs were calculated using the geo-referenced models PhATE for North America and GREAT-ER for Europe. The combined PNEC for drinking water and fish consumption for CBZ is 226,000ng/L. Ninetieth percentile MECs ranged from 150 to 220ng/L, while 90th percentile PECs ranged from 333 to 658ng/L. Calculated margins of safety (MOS) therefore range from 340 to 1500. MOS for the major metabolites are significantly higher. This assessment indicates that CBZ and its major metabolites have high MOS (>>1) and thus should have no appreciable risk to human health through environmental exposures based on available human data.