• Loratadine is the generic version of the allergy medication Claritin. Loratadine is available over the counter at pharmacies, and is used to treat common allergy symptoms, such as a runny nose, sneezing or watery eyes. You may experience some side effects when taking Loratadine.
  
  

Headache

• Headaches are one of the most prominent reactions to Loratadine, according to Medicine Net. Head pain may be localized on one side of your head or occur throughout your head.
  
  

Diarrhea

• Some individuals may experience diarrhea while taking Loratadine. If you experience this side effect, drink extra fluids to stay hydrated. If the diarrhea persists after a few days, contact your doctor to ensure you do not become dehydrated.
  
  

Dry Mouth

• Dry Mouth sometimes occurs while taking Loratadine. Because Loratadine is an antihistamine, it is designed to dry up excess bodily mucous in the nasal and throat passages. This sometimes causes users to experience a dry mouth. If you experience unusual dryness, increase your fluid intake.
  
  

Fatigue

• Fatigue may occur periodically while you are taking this medication or may persist for the duration. If you experience unusual fatigue, try reducing your daily activities or taking a nap mid-afternoon. If this does not alleviate the symptom, contact your doctor to discuss further options.
  
  

Nose Bleeds

• Nose bleeds occasionally occur while you are taking Loratadine. Nose bleeds are characterized by blood leaking out of one or both nostrils. If you experience a nose bleed while taking this medication, use a cotton ball to absorb the blood and contact your physician.