FREE SHIPPING on every order to the US
Phone: 1-800-281-8347
Fax: 1-866-454-2734
Email: [email protected]

We're currently experiencing phone and Internet issues in our call center, which may result in dropped calls or extended wait times. We're sorry for the inconvenience and are working to get it resolved as quickly as possible.

Nytol (Diphenhydramine Hydrochloride)

Sorry, we currently do not carry this product.



Diphenhydramine Hydrochloride Information

(dye fen hye' dra meen)

Diphenhydramine injection is used to treat allergic reactions, especially for people who are unable to take diphenhydramine by mouth. It is used also to treat motion sickness. Diphenhydramine injection is also used alone or along with other medications to control abnormal movements in people who have Parkinsonian syndrome (a disorder of the nervous system that causes difficulties with movement, muscle control, and balance). Diphenhydramine injection should not be used in newborn or premature infants. Diphenhydramine injection is in a class of medications called antihistamines. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms.

Diphenhydramine injection comes as a solution (liquid) to be injected intramuscularly (into a muscle) or intravenously (into a vein). Your dosing schedule will depend on your condition and on how you respond to treatment. You may receive diphenhydramine injection in a hospital or you may administer the medication at home. If you will be using diphenhydramine injection at home, your healthcare provider will show you how to use the medication. Be sure that you understand these directions, and ask your healthcare provider if you have any questions.

    Before using diphenhydramine injection,
  • tell your doctor and pharmacist if you are allergic to diphenhydramine, other antihistamine medications including dimenhydrinate (Dramamine), any other medications, or any of the ingredients in diphenhydramine injection. Ask your pharmacist for a list of the ingredients.
  • tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention the following: monoamine oxidase (MAO) inhibitors such as isocarboxazid (Marplan), phenelzine (Nardil), selegiline (Eldepryl, Emsam, Zelapar), and tranylcypromine (Parnate); muscle relaxants; sedatives; sleeping pills; and tranquilizers.
  • tell your doctor if you are breastfeeding. Your doctor will probably tell you not to use diphenhydramine injection if you are breastfeeding because of the risk of harm to infants.
  • tell your doctor if you have or have ever had asthma or other types of lung disease; glaucoma (a condition in which increased pressure in the eye can lead to gradual loss of vision); ulcers; prostatic hypertrophy (enlargement of the prostate gland) or difficulty urinating (due to an enlarged prostate gland); heart disease; high blood pressure; or hyperthyroidism (a condition where the thyroid gland produces too much thyroid hormone).
  • tell your doctor if you are pregnant or plan to become pregnant. If you become pregnant while using diphenhydramine injection, call your doctor.
  • you should know that diphenhydramine injection may make you drowsy. Do not drive a car or operate machinery until you know how this medication affects you.
  • ask your doctor about the safe use of alcoholic beverages while you are using diphenhydramine injection. Alcohol can make the side effects from diphenhydramine injection worse.

Unless your doctor tells you otherwise, continue your normal diet.

Diphenhydramine injection may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
  • headache
  • dizziness
  • tiredness
  • confusion
  • restlessness
  • excitement (especially in children)
  • nervousness
  • irritability
  • difficulty falling asleep or staying asleep
  • vision changes
  • stomach discomfort
  • nausea
  • vomiting
  • constipation
  • difficulty urinating
  • change in urinary frequency
  • ringing in the ears
  • dry mouth, nose, or throat
  • problems with coordination
  • uncontrollable shaking of a part of the body
Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately or get emergency medical treatment:
  • rash
  • hives
  • chills
  • chest tightness
  • wheezing
  • seizures
Diphenhydramine injection may cause other side effects. Call your doctor if you have any unusual problems while using this medication.

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from light, excess heat and moisture (not in the bathroom). Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them. However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. Talk to your pharmacist or contact your local garbage/recycling department to learn about take-back programs in your community. See the FDA's Safe Disposal of Medicines website (http://goo.gl/c4Rm4p) for more information if you do not have access to a take-back program. It is important to keep all medication out of sight and reach of children as many containers (such as weekly pill minders and those for eye drops, creams, patches, and inhalers) are not child-resistant and young children can open them easily. To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location – one that is up and away and out of their sight and reach. http://www.upandaway.org

In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at https://www.poisonhelp.org/help. If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911.

Ask your pharmacist any questions you have about diphenhydramine injection. It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies. ¶ This branded product is no longer on the market. Generic alternatives may be available.

COVID-19 Service Update

We continue to do our best to offer you great service and affordable medications, but our service standards have been unavoidably impacted.

Learn More

My Account

You're currently not logged in. Login here

Get a free account
Forgot your password?

Shopping Cart

There are currently no items in your cart.

Most Recent Reviews

- very pleased with your service
Joseph J McLaughlin, Oct 15th, 2021

- Very pleased with your customer service. Prices are less then I pay under my Medicare Insurance.
Martha Bittner, Oct 15th, 2021

- My Blue Cross insurance quit covering my estring and a friend recommended Pharmstore. My cost from them is only a few dollars more than what Blue Cross charged me when they covered it since they made me pay 3 co-pays since it works for 90 days. S...
Ava C, Oct 15th, 2021

- Prompt service. Great follow up
Alan , Oct 15th, 2021

Canada Pharmacy Reviews

View all 28948 reviews Leave a review PharmStore Facebook