Benadryl (Diphenhydramine)

Benadryl is used for preventing or treating symptoms of hay fever and other upper respiratory allergies or the common cold, such as runny nose, sneezing, itching of the nose and throat, and itchy, watery eyes, and relieving cough.

It may also relieve itching of the skin and allergic skin reactions. It is also used to treat and prevent motion sickness. It may also be used for other conditions as determined by your doctor.

Benadryl is an antihistamine and anticholinergic. It works by blocking the action of histamine, reducing the symptoms of an allergic reaction. It also works in the brain to cause sedation.

Do NOT use Benadryl if:

• you are allergic to any ingredient in this medicine or other similar medicines
• you are taking sodium oxybate (GHB)
• you are currently taking or have taken a monoamine oxidase (MAO) inhibitor (eg, phenelzine) in the past 14 days
• you are breast-feeding

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have asthma, chronic obstructive pulmonary disease (COPD), chronic bronchitis, emphysema, lung disease, shortness of breath, or sleep apnea
• if you have blockage of the stomach, intestine, or urinary tract; difficulty urinating; diabetes; ulcers; enlargement of the prostate; glaucoma; heart disease; high blood pressure; porphyria; or thyroid disease

• Sodium oxybate (GHB) because an increase in sleep duration and a decrease in the ability to breathe are likely to occur
• MAO inhibitors (eg, phenelzine) because they can cause serious, sometimes fatal, reactions. Do NOT take MAO inhibitors within 2 weeks of taking Benadryl.

Check with your doctor if any of these most common side effects persist or become bothersome:

• dizziness; drowsiness; dry mouth, throat, and nose; excitability; thickening of mucus in nose or throat.

• severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); convulsions; fast heartbeat or pounding in the chest; decreased alertness; hallucinations; tremor; wheezing.

Benadryl is to be used only by the patient for whom it is prescribed. Do not share it with other people.
If your symptoms do not improve or if they become worse, check with your doctor.