Benadryl (diphenhydramine)
Benadryl is a brand name for the drug diphenhydramine, which is an antihistamine medication used to treat symptoms of allergies, such as sneezing, runny nose, itching, and hives. It works by blocking the action of histamine, a substance released by the body in response to allergens, which causes allergic symptoms.
Benadryl is available in various forms, including tablets, capsules, liquid, and topical creams. It is also sometimes used to treat other conditions, such as insomnia or motion sickness. In addition to its antihistamine effects, Benadryl can also cause drowsiness and is sometimes used as a sleep aid.
Benadryl is available over-the-counter in many countries, although the availability and dosage may vary depending on the country and specific product. In some countries, it may be available only by prescription or in a different formulation. It’s important to talk to your healthcare provider before using Benadryl or any other medication, particularly if you have any underlying medical conditions or are taking other medications.
When is Benadryl used?
Benadryl is used to treat symptoms of allergies, such as sneezing, runny nose, itching, and hives. It works by blocking the action of histamine, a substance released by the body in response to allergens, which causes allergic symptoms.
Benadryl is also sometimes used to treat other conditions, such as:
- Insomnia: Because Benadryl can cause drowsiness, it is sometimes used as a sleep aid.
- Motion sickness: Benadryl may help relieve symptoms of motion sickness, such as nausea and vomiting.
- Parkinson’s disease: Benadryl may be used to treat some symptoms of Parkinson’s disease, such as tremors and muscle stiffness.
- Anxiety: Benadryl may be used to help relieve mild anxiety.
- Itching: Benadryl may be used to relieve itching caused by skin conditions such as eczema or insect bites.
However, it’s important to talk to your healthcare provider before using Benadryl or any other medication, particularly if you have any underlying medical conditions or are taking other medications. They can advise you on the appropriate dose and any potential risks or side effects to be aware of.
How long does Benadryl stay in your system?
The duration of action of Benadryl (diphenhydramine) can vary depending on the formulation, dosage, and individual factors such as age, weight, and metabolism. In general, the effects of Benadryl last for about 4-6 hours after taking an oral dose, and the drug is typically eliminated from the body within 24-48 hours.
However, the duration of action and elimination of Benadryl can be longer or shorter in certain individuals or under certain conditions. For example, older adults may metabolize the drug more slowly, leading to a longer duration of action and a greater risk of side effects. Similarly, individuals with liver or kidney disease may eliminate the drug more slowly, leading to a longer duration of action and an increased risk of toxicity.
It’s important to follow the recommended dosing instructions and talk to your healthcare provider before using Benadryl or any other medication, particularly if you have any underlying medical conditions or are taking other medications. They can advise you on the appropriate dose and any potential risks or side effects to be aware of, and can help monitor your response to the drug over time.
What are contraindications with Benadryl?
There are several contraindications (conditions or situations in which a medication should not be used) with Benadryl (diphenhydramine). These include:
- Hypersensitivity or allergy: Individuals who have had an allergic reaction to diphenhydramine or other antihistamines should not take Benadryl.
- Acute asthma attacks: Benadryl can thicken respiratory secretions and make it more difficult to breathe, so it should not be used during an acute asthma attack.
- Glaucoma: Benadryl can increase intraocular pressure, which can worsen the symptoms of glaucoma.
- Prostate enlargement: Benadryl can worsen the symptoms of prostate enlargement, such as difficulty urinating.
- Pregnancy and breastfeeding: Benadryl should be used with caution during pregnancy and breastfeeding, as it can cross the placenta and be excreted in breast milk.
- Central nervous system depression: Benadryl can cause drowsiness and impair cognitive and motor function, so it should be used with caution in individuals who are already experiencing central nervous system depression, such as those who have taken other sedatives or alcohol.
It’s important to talk to your healthcare provider before using Benadryl or any other medication, particularly if you have any underlying medical conditions or are taking other medications. They can advise you on the appropriate dose and any potential risks or side effects to be aware of, and can help monitor your response to the drug over time.
What are side effects of Benadryl?
Like all medications, Benadryl (diphenhydramine) can cause side effects. Some common side effects include:
- Drowsiness
- Dry mouth, nose, or throat
- Dizziness
- Nausea or vomiting
- Constipation or diarrhea
- Headache
- Blurred vision
- Difficulty urinating
These side effects are usually mild and go away on their own, but if they persist or become severe, it’s important to talk to your healthcare provider.
Benadryl can also cause more serious side effects in some individuals, particularly at higher doses or with prolonged use. These can include:
- Confusion or hallucinations
- Rapid or irregular heartbeat
- Seizures
- Tremors or muscle stiffness
- Difficulty breathing
- Swelling of the face, lips, tongue, or throat (signs of an allergic reaction)
If you experience any of these more serious side effects, seek medical attention immediately.
It’s important to talk to your healthcare provider before using Benadryl or any other medication, particularly if you have any underlying medical conditions or are taking other medications. They can advise you on the appropriate dose and any potential risks or side effects to be aware of, and can help monitor your response to the drug over time.