Cystinol Akut Dragees (Dry Extract From Bearberry Leaf (3,5-5,5:1), Extraction Solvent: Ethanol 60% (V/V))

Cystinol Akut Dragees are commonly used to support urinary tract health and to help reduce the risk of urinary tract infections.

• Support of normal urinary tract function.
• Prevention of recurrent urinary tract infections in adults.
• Adjunctive care during periods of increased urinary stress (e.g., travel).
• Maintenance of urinary tract hygiene in individuals with a history of uropathogen colonisation.

The safety profile of bearberry leaf extract reflects the pharmacology of its main constituent, arbutin, which is converted to hydroquinone in the urinary tract.

Common

• Mild gastrointestinal discomfort such as nausea or abdominal cramps.
• Transient darkening of urine due to hydroquinone metabolites.
• Mild skin irritation or rash at the site of contact.
• Headache or dizziness in susceptible individuals.

Serious

• Allergic reactions including swelling of the face, lips, or throat.
• Hepatotoxicity manifested by elevated liver enzymes.
• Hemolytic anemia in persons with glucose‑6‑phosphate dehydrogenase (G6PD) deficiency.
• Severe hypotension or syncope after high‑dose exposure.

When considering Cystinol Akut Dragees, certain precautionary measures should be observed to minimise risk.

• Not recommended for pregnant or breastfeeding women unless advised by a healthcare professional.
• Avoid use in children under 12 years of age.
• Persons with known G6PD deficiency should refrain from use.
• Individuals with chronic kidney disease should consult a physician before taking the product.
• Patients taking anticoagulant therapy should be monitored for potential interactions.
• Discontinue use and seek medical advice if any allergic symptoms develop.

Bearberry leaf extract may interact with several medicines, and the nature of the interaction determines whether the combination should be avoided or used with caution.

Avoid

• Warfarin or other vitamin K antagonists, because hydroquinone may enhance anticoagulant effects.
• Antidiabetic agents, as the extract may potentiate hypoglycaemia.
• Lithium therapy, due to possible increased lithium levels.
• Other urinary antiseptics or antibiotics targeting the same pathogens, which could lead to additive effects.

Use with caution

• Diuretics, because increased urinary output may alter the concentration of active metabolites.
• Non‑steroidal anti‑inflammatory drugs (NSAIDs), which may increase the risk of renal irritation.
• Herbal supplements containing high levels of phenolic compounds, which could compound hepatic metabolism.