Why is this medication prescribed?

Diphenhydramine is an antihistamine that is commonly used for various purposes. Its primary use is to relieve symptoms associated with allergies, such as sneezing, itching, watery eyes, and runny nose. It is also used to alleviate symptoms of the common cold, hay fever, and other respiratory allergies. In addition to its antihistamine properties, diphenhydramine has sedative effects, making it useful for the treatment of insomnia and as a sleep aid.

How should this medicine be used?

Diphenhydramine is an antihistamine that is commonly used to relieve symptoms of allergy, hay fever, and the common cold. It is also used to treat insomnia and motion sickness. However, it’s important to use diphenhydramine as directed by a healthcare professional, as improper use can lead to side effects.

Here are general guidelines for the use of diphenhydramine:

• Dosage: Follow the dosage instructions provided by your healthcare provider or on the product packaging. Dosages can vary depending on the formulation (e.g., liquid, tablet, or capsule) and the specific condition being treated.
• Allergies and Cold Symptoms: If you’re using diphenhydramine to relieve allergy or cold symptoms, take it as directed. It may cause drowsiness, so avoid activities that require alertness, such as driving, until you know how the medication affects you.
• Insomnia: If you’re using diphenhydramine to treat insomnia, take it about 30 minutes before bedtime. It’s important not to exceed the recommended dosage, and prolonged use for sleep should be done under the guidance of a healthcare professional.
• Motion Sickness: If using diphenhydramine for motion sickness, take it before travel as directed. Again, be cautious about activities requiring alertness.
• Do Not Exceed Recommended Dosage: Taking more than the recommended dosage can lead to serious side effects, including overdose. If you suspect an overdose or experience severe side effects, seek medical attention immediately.
• Avoid Alcohol: Alcohol can enhance the sedative effects of diphenhydramine, so it’s advisable to avoid alcohol while taking this medication.
• Precautions: Inform your healthcare provider about any other medications you are taking to avoid potential interactions. Diphenhydramine may interact with certain medications or medical conditions.
• Special Populations: Use caution in elderly individuals, as they may be more sensitive to the sedative effects. Pregnant or breastfeeding women should consult with their healthcare provider before using diphenhydramine.

Always consult with a healthcare professional before using diphenhydramine, especially if you have any underlying medical conditions or are taking other medications. If you have any concerns or experience unusual side effects, contact your healthcare provider promptly.

Other uses for this medicine

In addition to its common uses for allergy relief, sleep aid, and motion sickness, diphenhydramine may be used for other purposes as recommended by a healthcare professional. Some of the potential alternative uses include the treatment of mild reactions to blood transfusions, prevention and treatment of nausea and vomiting associated with certain medications, and relief of symptoms related to Parkinson’s disease.

What special precautions should I follow?

Special precautions to consider when using diphenhydramine:

• Sedation: Diphenhydramine can cause drowsiness, so individuals taking this medication should be cautious when engaging in activities that require alertness, such as driving or operating machinery.
• Alcohol and Other Sedatives: Combining diphenhydramine with alcohol or other central nervous system depressants can increase sedation and may lead to adverse effects. Avoid alcohol and other sedatives while taking diphenhydramine.
• Medical Conditions: Inform your healthcare provider about any pre-existing medical conditions, especially asthma, glaucoma, urinary retention, enlarged prostate, hyperthyroidism, or hypertension, as diphenhydramine may exacerbate these conditions.
• Pregnancy and Breastfeeding: Pregnant or breastfeeding individuals should consult their healthcare provider before using diphenhydramine, as it may pass into breast milk and could have potential effects on the baby.
• Children and Elderly: Use caution in children and elderly individuals, as they may be more sensitive to the sedative effects of diphenhydramine.
• Allergies and Sensitivities: If you have a known allergy to diphenhydramine or other antihistamines, you should avoid using it. Also, inform your healthcare provider about any other allergies you may have.

It’s crucial to follow the recommended dosage and guidelines provided by your healthcare provider or on the medication packaging. If you have any concerns or experience unexpected side effects, consult with your healthcare professional promptly.

What special dietary instructions should I follow?

There are no specific dietary restrictions associated with diphenhydramine. However, it’s important to note that consuming alcohol or certain foods that may cause drowsiness can enhance the sedative effects of diphenhydramine. It’s advisable to avoid such substances while taking the medication.

What should I do if I forget a dose?

If you miss a dose of diphenhydramine, take it as soon as you remember. However, if it’s almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one.

What side effects can this medication cause?

Diphenhydramine, like any medication, can cause side effects. Not everyone will experience these side effects, and their severity can vary. Common side effects of diphenhydramine include:

• Sedation and Drowsiness: Diphenhydramine is known for its sedative effects, and drowsiness is a common side effect. This can impair your ability to concentrate and may affect activities that require alertness, such as driving.
• Dry Mouth and Throat: Diphenhydramine has anticholinergic properties that can lead to dry mouth and throat.
• Urinary Retention: Some people may experience difficulty urinating or incomplete emptying of the bladder.
• Constipation: Diphenhydramine can cause constipation due to its anticholinergic effects on the digestive system.
• Blurred Vision: Blurred vision may occur, especially at higher doses.
• Confusion (especially in the elderly): The elderly may be more susceptible to confusion and other cognitive effects.
• Dizziness and Lightheadedness: These symptoms may occur, particularly when standing up quickly from a sitting or lying position.
• Increased Heart Rate (Tachycardia): In some cases, diphenhydramine may cause an increased heart rate.
• Allergic Reactions: While uncommon, some individuals may experience an allergic reaction to diphenhydramine, which can manifest as rash, itching, swelling, severe dizziness, or difficulty breathing. Seek medical attention if you experience these symptoms.

It’s important to note that excessive use or misuse of diphenhydramine can lead to more severe side effects, including hallucinations, seizures, and serious cardiac effects. Always take diphenhydramine as directed by your healthcare provider and do not exceed the recommended dose.

If you experience persistent or severe side effects, contact your healthcare provider. Additionally, if you have any concerns about potential drug interactions or if you are taking other medications, it’s advisable to discuss them with your healthcare provider or pharmacist.

What should I know about storage and disposal of this medication?

Storage and Disposal of Diphenhydramine:

Storage:

• Store diphenhydramine at room temperature, away from excessive heat and moisture.
• Keep it out of reach of children and pets.
• Follow any specific storage instructions provided on the medication packaging.

Disposal:

• Dispose of expired or unused diphenhydramine properly. Check with your local pharmacy or healthcare provider for guidance on how to dispose of medications.
• Do not flush diphenhydramine down the toilet unless specifically instructed to do so by your healthcare provider or the medication packaging.

In case of emergency/overdose

• In case of an overdose or emergency, call your local poison control center at 1-800-222-1222 (in the United States) or emergency services immediately.
• Symptoms of overdose may include extreme drowsiness, confusion, hallucinations, seizures, or a fast/irregular heartbeat.
• If someone collapses or has trouble breathing after taking diphenhydramine, call emergency services right away.

What other information should I know?

• Medical Alert: Inform all healthcare providers about your use of diphenhydramine, including over-the-counter and prescription medications, to avoid potential interactions.
• Avoid Alcohol: Limit or avoid alcohol consumption while using diphenhydramine, as it can enhance the sedative effects and increase the risk of drowsiness.
• Avoid Driving and Machinery: Due to its sedative effects, avoid activities that require mental alertness, such as driving or operating machinery, until you know how diphenhydramine affects you.
• Pregnancy and Breastfeeding: Consult with your healthcare provider before using diphenhydramine if you are pregnant, planning to become pregnant, or breastfeeding.
• Allergic Reactions: If you experience symptoms of an allergic reaction (e.g., rash, itching, swelling, severe dizziness, difficulty breathing), seek medical attention promptly.
• Follow Dosage Instructions: Adhere to the recommended dosage and dosing schedule provided by your healthcare provider or on the product label. Do not exceed the recommended dose unless directed by a healthcare professional.
• Inform Healthcare Provider: If you are scheduled for surgery or any medical procedure, inform your healthcare provider about your use of diphenhydramine.

Always consult with your healthcare provider for personalized advice based on your specific health condition and needs. The information provided here is general and may not cover all individual circumstances or potential interactions.