In extreme situations, it may be legally fair to dismiss a frequently absent employee even if the absence is genuine - usually on grounds of medical capability.
But this should only be a last resort after thorough and careful process of medical investigation and consultation and after all other avenues have been explored. Dismissal is always a last resort and you should consider as many ways as possible to help the employee back to work, including;
- Getting a medical report from their GP with the employee’s permission - they have the right to see the report before you do.
- Arranging an occupational health assessment.