Answer
An erection lasting four hours or longer needs immediate medical treatment to reduce the risk of permanent tissue damage.
Sources for this answer
- Tadalafil Milpharm 2.5 mg film-coated tablets — Current selected SmPCemc · Summary of Product Characteristics
- Adcirca — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.