... suggestions? I have high blood pressure, Hepatitis B, and very bad allergy symptoms. I need medication to control the year-round itchy throat and other allergy symptoms. I am looking for antihistamines that won't increase blood pressure, affect liver, and driving. Chlorpheniramine Maleate 4 mg causes marked drowsiness for hours. Loratadine 10 mg may cause liver damage. I have tried Sudafed, Chlorpheniramine, and Loratadine and many, many other meds, I need help to find the right medicine that will provide allergy relief without the three side effects mentioned above. Your input will be greatly appreciated.