Benztropine is used with other medicines to treat symptoms of Parkinson’s disease, such as stiffness or tremors.

Benztropine is also used to treat Parkinson-like symptoms caused by using certain medicines.

Benztropine may also be used for purposes not listed in this medication guide.

Benztropine side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Benztropine may cause serious side effects. Call your doctor at once if you have:

• dry mouth that causes trouble talking or swallowing;
• little or no urination;
• uncontrolled muscle movements;
• vomiting, severe constipation;
• fast heartbeats;
• muscle weakness;
• blurred vision, tunnel vision, eye pain, or seeing halos around lights;
• confusion, hallucinations; or
• severe skin rash.

Common side effects of benztropine may include:

• dry mouth;
• blurred vision;
• constipation; or
• nausea.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

Warnings

Use only as directed. Tell your doctor if you use other medicines or have other medical conditions or allergies.

Before taking this medicine

You should not use benztropine if you are allergic to it.

Not approved for use by anyone younger than 3 years old.

Tell your doctor if you have ever had:

• an enlarged prostate;
• urination problems;
• glaucoma; or
• muscle problems.

Older adults may be more sensitive to the effects of benztropine.

It is not known if benztropine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Tell your doctor if you are breastfeeding.

How should I take benztropine?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Benztropine oral is taken by mouth.

Benztropine is usually taken at bedtime.

Benztropine injection is given in a muscle or vein if you are unable to take the medicine by mouth.

Drink plenty of water to prevent dry mouth while taking benztropine.

Dry mouth may lead to gum disease or cavities. Brush and floss your teeth regularly and visit your dentist for routine dental care.

Call your doctor if your symptoms do not improve, or if they get worse.

Your symptoms may get worse if you stop using benztropine suddenly. Ask your doctor before stopping any of your anti-Parkinson medications.

Store at room temperature away from moisture, heat, and light.

What happens if I miss a dose?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line .

Overdose may cause drowsiness, confusion, nervousness, hallucinations, fast heart rate, vomiting, numbness in your fingers, hot or dry skin, or fainting.

What should I avoid while taking benztropine?

Avoid driving or hazardous activity until you know how benztropine will affect you. Your reactions could be impaired.

Avoid becoming overheated or dehydrated during exercise and in hot weather. Benztropine can decrease sweating and you may be more prone to heat stroke.

What other drugs will affect benztropine?

Tell your doctor about all your other medicines, especially:

• other medicine to treat Parkinson’s disease;
• medicine to treat depression, anxiety, mood disorders, or mental illness;
• cold or allergy medicine (Benadryl and others);
• medicine to treat stomach problems, motion sickness, or irritable bowel syndrome;
• medicine to treat overactive bladder; or
• bronchodilator asthma medication.

Benadryl is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.

Benadryl is used to treat sneezing, runny nose, watery eyes, hives, skin rash, itching, and other cold or allergy symptoms.

Benadryl is also used to treat motion sickness, to induce sleep, and to treat certain symptoms of Parkinson’s disease.

Warnings

You should not use Benadryl to make a child sleepy.

When taking Benadryl, use caution driving, operating machinery, or performing other hazardous activities. Diphenhydramine may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities.

Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while taking Benadryl.

Do not give this medication to a child younger than 2 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Before taking this medicine

You should not use Benadryl if you are allergic to diphenhydramine.

Ask a doctor or pharmacist if it is safe for you to take this medicine if you have other medical conditions, especially:

• blockage in your digestive tract (stomach or intestines);
• bladder obstruction or other urination problems;
• a colostomy or ileostomy;
• liver or kidney disease;
• asthma, chronic obstructive pulmonary disease (COPD), or other breathing disorder;
• cough with mucus, or cough caused by smoking, emphysema, or chronic bronchitis;
• heart disease, low blood pressure;
• glaucoma;
• a thyroid disorder; or
• if you take potassium (Cytra, Epiklor, K-Lyte, K-Phos, Kaon, Klor-Con, Polycitra, Urocit-K).

It is not known whether Benadryl will harm an unborn baby. Ask a doctor before using this medicine if you are pregnant.

Diphenhydramine can pass into breast milk and may harm a nursing baby. Antihistamines may also slow breast milk production. Ask a doctor before using this medicine if you are breast-feeding.

Older adults may be more likely to have side effects from this medicine.

How should I take Benadryl?

Use Benadryl exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended. Cold or allergy medicine is usually taken only for a short time until your symptoms clear up.

Do not give this medication to a child younger than 2 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

You should not use Benadryl to make a child sleepy.

Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.

For motion sickness, take Benadryl 30 minutes before you will be in a situation that causes you motion sickness (such as a long car ride, airplane or boat travel, amusement park rides, etc). Continue taking Benadryl with meals and at bedtime for the rest of the time you will be in a motion-sickness situation.

As a sleep aid, take Benadryl within 30 minutes before bedtime.

Call your doctor if your symptoms do not improve after 7 days of treatment, or if you have a fever with a headache, cough, or skin rash.

This medication can affect the results of allergy skin tests. Tell any doctor who treats you that you are using Benadryl.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Since Benadryl is used when needed, you may not be on a dosing schedule. If you are on a schedule, use the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not use extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line .

What to avoid

Benadryl may cause blurred vision and may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.

Drinking alcohol can increase certain side effects of diphenhydramine.

Ask a doctor or pharmacist before using any other cold, cough, allergy, or sleep medicine. Antihistamines are contained in many combination medicines. Taking certain products together can cause you to get too much of this type of medicine. Check the label to see if a medicine contains an antihistamine.

Benadryl side effects

Get emergency medical help if you have signs of an allergic reaction to Benadryl: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using Benadryl and call your doctor at once if you have:

• pounding heartbeats or fluttering in your chest;
• painful or difficult urination;
• little or no urinating;
• confusion, feeling like you might pass out; or
• tightness in your neck or jaw, uncontrollable movements of your tongue.

Common Benadryl side effects may include:

• dizziness, drowsiness, loss of coordination;
• dry mouth, nose, or throat;
• constipation, upset stomach;
• dry eyes, blurred vision; or
• day-time drowsiness or “hangover” feeling after night-time use.