Eye drops can be a great benefit to most who suffer from eye allergies. However, some patients have conditions that should be weighed before a decision is made on treatment. A physician should be informed of the following:

• Past allergic reactions to antihistamines, decongestants, aspirin and other medications.
  
  
• Medicines currently taken by the patient.
  
  
• Pregnancy or intention to become pregnant.
  
  
• Breastfeeding.
  
  
• Contact lens use.
  
  
• Present bacterial infection of the eye, including pink eye (conjunctivitis).
  
  
• Hemophilia or other bleeding disorders. Anti-inflammatories can worsen these conditions.
  
  
• Diabetes. Decongestants can worsen this condition.
  
  
• Heart disease. Using antihistamines with decongestants can aggravate some heart conditions.
  
  
• High blood pressure. Using antihistamines with decongestants can aggravate this condition.
  
  
• Glaucoma (a disorder that involves optic nerve damage). Using antihistamines with decongestants can aggravate this condition.
  
  
• Overactive thyroid. Medications containing naphazoline can worsen this condition.
  
  
• Eye disease or injury. Problems that stem from these conditions may be confused with side effects of the drug ophthalmic naphazoline (a decongestant).
  
  
• Difficulty urinating due to an enlarged prostate. Medications containing antihistamines can aggravate this condition.