MedDRA konventioner for hyppighed er meget almindelig (> 10%), almindelig (> 1% til < 10%), ualmindelig (> 0, 1% til < 1%), sjælden (> 0, 01% til < 0, 1%) eller meget sjælden (< 0, 01%), inklusive enkeltstående rapporteringer.
MedDRA conventions for frequency are very common (> 10%), common (> 1% to < 10%), uncommon (> 0.1% to< 1%), rare (> 0.01% to < 0.1%), or very rare (< 0.01%), including isolated reports.