Claritin (Loratadine) serious side effects. Call your doctor at once if you have a serious side effect such as:
- fast or uneven heart rate
- feeling like you might pass out
- jaundice (yellowing of your skin or eyes)
- seizures (convulsions)
Claritin (Loratadine) serious side effects. Call your doctor at once if you have a serious side effect such as: