Before you begin using a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Diphenhydramine.
Asthma or breathing problems: Diphenhydramine can cause the secretions produced in the lungs to become thick and difficult to clear out of the lungs. If you have breathing problems such as asthma or COPD (Chronic Obstructive Pulmonary Disease) (COPD), discuss with your doctor discuss with your doctor how Diphenhydramine may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Diphenhydramine, and whether any special monitoring is needed.
Drowsiness/reduced alertness: Diphenhydramine can cause drowsiness. Avoid driving or operating machinery until you have determined that Diphenhydramine does not affect your ability to perform these tasks safely.
Glaucoma: Diphenhydramine may cause the symptoms of glaucoma (increased pressure in the eye) to become worse. If you have glaucoma, discuss with your doctor how Diphenhydramine may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Diphenhydramine, and whether any special monitoring is needed. Report any changes in vision to your doctor as soon as possible while you are taking this medication.
Skin conditions: The topical cream should not be used on chickenpox, measles, or extensive areas of the skin. Avoid applying the cream to raw or open areas of skin. If the condition worsens or lasts for longer than 7 days, contact your doctor. Other medications containing diphenhydramine (e.g., tablets, capsules, liquids) should not be used while using the cream.
Stomach ulcers: Diphenhydramine may make the symptoms of stomach ulcers worse. If you have stomach problems, discuss with your doctor how Diphenhydramine may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Diphenhydramine, and whether any special monitoring is needed.
Urinary tract problems: Diphenhydramine can make passing urine more difficult, increasing the symptoms of an enlarged prostate gland or other urinary tract problems. If you have prostate problems or difficulty passing urine, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Diphenhydramine, and whether any special monitoring is needed.
Pregnancy: Diphenhydramine should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking Diphenhydramine, contact your doctor immediately.
Breast-feeding: The safety of using Diphenhydramine while breast-feeding has not been established. If you are a breast-feeding mother and are taking Diphenhydramine, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: Children are at an increased risk of overdose and side effects from Diphenhydramine. Antihistamines such as diphenhydramine can cause excitation in young children.
Seniors: If you are a senior, Diphenhydramine may be more likely to cause dizziness, drowsiness, and Low Blood Pressure. Talk to your doctor or pharmacist before taking Diphenhydramine.
