Genetic makeup of a patient influences the efficacy and safety profile of a drug. This study is to summarize individual cases, where Pharmacogenetics (PGx) has been applied during pharmaceutical care. The primary objective is the compilation of case reports, where pharmacogenetic testing is applied to determine the hereditable component of the patient's susceptibility to experience therapy failure and/or adverse drug reactions. The experience with the compiled cases will be basis for the development of a reliable standard of procedure for pharmacogenetic testing in the community pharmacy. The cases will be supplemented with information on additional Parameters reported in the literature to affect efficacy or safety of the respective drug.

Genetic makeup of a patient influences the efficacy and safety profile of a drug. This study is to summarize individual cases, where Pharmacogenetics (PGx) has been applied during pharmaceutical care. Health-related data of patients experiencing therapy failure (TF) or adverse drug reaction (ADR) is collected and will then be supplemented with pharmacogenetic testing during pharmaceutical care in a study pharmacy. The patient data (diagnoses, medications and results of pharmacogenetic testing) is harmonized in order to generate a compilation of case reports. The primary objective is the compilation of case reports, where pharmacogenetic testing is applied to determine the hereditable component of the patient's susceptibility to experience therapy failure and/or adverse drug reactions. The experience with the compiled cases will be basis for the development of a reliable standard of procedure for pharmacogenetic testing in the community pharmacy. The cases will be supplemented with information on additional Parameters reported in the literature to affect efficacy or safety of the respective drug.

Inclusion Criteria:

• New medication with known PGx association (preemptive)
• Current medication with observation of adverse drug reactions probably linked to drugs with known PGx association (reactive)
• Current medication with observation of therapy failure probably linked to drugs with known PGx association (reactive)
• Current and/or new medication and a family history of adverse drug reactions/therapy failure probably linked to drugs with known PGx association
• Signed informed consent; for patients < 14 years, the legal representative needs to sign the informed consent

Exclusion Criteria:

• Insufficient German knowledge
• Not able to personally visit to the study pharmacy

The patient population are patients experiencing TF and/or ADRs with substances known to be affected by genetic variants that influence their drug metabolism (pharmacokinetics) and/or the activity of the drug target (pharmacodynamics).