Medically reviewed by Drugs. Last updated on Apr 22, Benadryl diphenhydramine hydrochloride is an antihistamine drug having the chemical name 2- Diphenylmethoxy -N,N-dimethylethylamine hydrochloride. It occurs as a white, crystalline powder, is freely soluble in water and alcohol and has a molecular weight of The structural formula is as follows:.
Benadryl in the parenteral form is a sterile, pyrogen-free solution available in a concentration of 50 mg of diphenhydramine hydrochloride per mL. The solutions for parenteral use have been adjusted to a pH between 5. Diphenhydramine hydrochloride is an antihistamine with anticholinergic drying and sedative side effects. Antihistamines appear to compete with histamine for cell receptor sites on effector cells.
Benadryl in the injectable form has a rapid onset of action. Diphenhydramine hydrochloride is widely distributed throughout the body, including the CNS. A portion of the drug is excreted unchanged in the urine, while the rest is metabolized via the liver.
Diphenhydramine (DPH): How Dangerous Is It to Abuse This Drug?
Detailed information on the pharmacokinetics of Diphenhydramine Hydrochloride Injection is not available. Benadryl in the injectable form is effective in adults and pediatric patients, other than premature infants and neonates, for the following conditions when Benadryl in the oral form is impractical.
For amelioration of allergic reactions to blood or plasma, in anaphylaxis as an adjunct to epinephrine and other standard measures after the acute symptoms have been controlled, and for other uncomplicated allergic conditions of the immediate type when oral therapy is impossible or contraindicated.
For use in parkinsonism, when oral therapy is impossible or contraindicated, as follows: parkinsonism in the elderly who are unable to tolerate more potent agents; mild cases of parkinsonism in other age groups, and in other cases of parkinsonism in combination with centrally acting anticholinergic agents. This drug should not be used in neonates or premature infants. Because of the higher risk of antihistamines for infants generally, and for neonates and prematures in particular, antihistamine therapy is contraindicated in nursing mothers.
Because of the risk of local necrosis, this drug should not be used as a local anesthetic.
Antihistamines are also contraindicated in the following conditions: Hypersensitivity to diphenhydramine hydrochloride and other antihistamines of similar chemical structure. Antihistamines should be used with considerable caution in patients with narrow-angle glaucoma, stenosing peptic ulcer, pyloroduodenal obstruction, symptomatic prostatic hypertrophy, or bladder-neck obstruction.
Local necrosis has been associated with the use of subcutaneous or intradermal use of intravenous Benadryl. In pediatric patients, especially, antihistamines in overdosage may cause hallucinations, convulsions, or death.
As in adults, antihistamines may diminish mental alertness in pediatric patients. In the young pediatric patient, particularly, they may produce excitation.
Antihistamines are more likely to cause dizziness, sedation, and hypotension in elderly patients.Forgot your password? Or sign in with one of these services. I know itchy skin can be a side effect, but what are some other alternative nursing interventions to relieve itching? I give it before the dilaudid - it is given for the side effect of itching. I can't think of a nursing intervention that will help the itchies other than benadryl.
If the pt is known to need it, I give it at the same time. That way I don't forget one or the other if I get busy. I work postpartum, so I frequently see c-section patients on PCAs with dilaudid. Itching is a frequent side effect of dilaudid and is usually benign but highly irritating. I give Benadryl as soon as the patient complains, because it's only going to get worse.
Most of the time there is no visible rash, and even if you see irritation, it could very well be from the patient's vigorous scratching. As far as, " alternative nursing interventions to relieve itching," I'm not aware of anything that works as effectively as Benadryl.
Itching, if it's strong enough, can be more aggravating than pain. It can disturb sleep, interfere with breastfeeding, and take an otherwise pleasant person and make her a little nuts.
I might sometimes encourage a patient to shower if I know she's been sweating a lot, but seriously, nothing takes care of opiate-related itching quite like Benadryl. In addition to helping with Dilaudid, Benadryl is usually the anesthesiologist's first choice to relieve itching related to Duramorph, which is what section patients get if they aren't put on a PCA.
I thought Benadryl with Dilaudid was just to increase the high. This question reminds me of my patients that come in with very convenient "allergies" to all pain meds except dilaudid, and oh yeah, also they need Phenergan for their nausea only thing that works, right? And they will want all three every four hours, watching that clock like a hawk. It's become such a common phenomenon at my work that we joke about it. Somewhere in my mind I am thinking that I also heard benadryl increases the high.
The times I have given it, the pt says dilaudid makes them incredible itchy, so it's done to prevent that. If it is ordered I give it either just before or just after the dilaudid I don't worry too much about my PCA c-section patients getting high. Besides, I give the Benadryl s-l-o-w-l-y. You know what they're after when they ask you to push it fast. The patients on my unit that have PCAs also usually have a narcan drip ordered to help with itching.
Benadryl doesn't always relieve the itching and you have to wait several hours between doses. Some patients do still like their benadryl. The slower you run it the less of that "high" they feel but yeah that is why a lot of patients want it.Akathisia is not well understood.
The feeling creates constant, repetitive movements like pacing, rocking back and forth, or swaying. Caused by antipsychotic or antidepressant drugs, the treatment for akathisia normally starts with stopping the medication. Tardive akathisia can start several months after beginning medication. Definition : Akathisia is a side effect of certain drugs based on an urgent feeling of physical restlessness. Akathisia is most common with older, first generation, high-potency antipsychotic drugs.
However, it can also occur with newer antipsychotics and other drugs. The most common treatment for drug-induced akathisia is to switch to a drug with less akathisia risk. In some cases a lower dose of the same drug may also be effective. The Symptoms of Akathisia generally center around repetitive, involuntary movements. Akathisia sufferers feel a compulsive need to move. To relieve it, they perform repetitive motions, such as:. Akathisia can also sometimes lead to violent, aggressive impulses or suicide.
The main culprit in cases of akathisia is older antipsychotic drugs, though antidepressants are also implicated. A number of antipsychotics and antidepressants may cause akathisia. See the partial list below. Diagnosing someone with akathisia consists mainly of identifying the symptoms above, then ruling out similar conditions.
The doctor will ask the patient about symptoms. Certain tests can rule out conditions similar to akathisia, such as:. Akathisia is such a tortuous condition that sufferers often panic, thinking it will never go away. Symptoms of the disease itself can magnify this fear. Thankfully, almost all akathisia from Abilify and other drugs does go away once the medication is stopped. Since akathisia is dose dependent with medications like Abilify, even a reduced dose can make the symptoms go away.
In some cases, akathisia can actually arise from Abilify withdrawal. In other words, the patient was healthy until Abilify was stopped. Acute, Chronic, and tardive akathisia all go away with time, whether caused by Latuda, Abilify, or another drug. In some rare cases, akathisia can persist even after medication has stopped. Akathisia is a surprisingly common side effect of antipsychotic drugs. Akathisia symptoms appear in:.
In one case inan 81 year-old patient on an SSRI experienced severe akathisia Six days after discontinuing the medication, symptoms subsided. In another case ina 52 year-old patient taking an SSRI began suffering from akathisia within two days of taking his first dose. Two days after starting on diazepam treatment, his akathisia resolved.
It did not return after stopping diazepam one week later. The good news about akathisia is that once the patient stops taking the medication, the symptoms usually go away within a week.I slept over my friends house last night, she can't smoke pot because shes on probation and gets random drug tests, I didn't want to because the night before someone either laced my weed or i got too high or something but i had a bad trip and have been considering quitting smoking pot because it was that scary.
But I wanted to do a bit more research on this first anyway. What do you know about getitng high off benadryl? If I do end up trying this how much should i take to make me hallucinate?
First off, i've done benadryl diphenhydramine a handful of times when I was younger. Mostly small doses pills The pills I had were the small pink ones. First time ever I took about 7. No body high or euphoria. Lots of confusion. I found that I had a hard time thinking. I would get up to go to the bathroom or get some water, but by the time I stood up I had completely forget what I was going to do.
Not very fun, just confusion, terrible memory, and my legs felt very weighed down. Not to say it was bad, it was pretty funny to be talking about something for 20 minutes, only to realize you have no idea what your talking about or how it got brought up, but I don't personally enjoy it much. One of the strangest nights of my life. I thought I wasn't high and that the pills didn't work at all until I found myself having a conversation with my guitar for a good 15 minutes.
My guitar was against a black chair in a dark room and it looked like it was disappearing and reappearing. There was a poster on my wall and it looked like the face on it was popping in and out at me really fast. When I looked away, i saw a blanket on my bed shaking violently, like there was a dog or animal under it trying to get out.
I looked at my walls, and they were morphing and waving in and out. I felt like everything was reaching for me to attack me. I started to get some bad vibes so I called up a friend to come chill.
I woke up the next morning with no memory of what happened after texted my friend. Apparently we hung out for two hours before I went home.If you are taking Benadryl as prescribed, your chances of becoming addicted to the active ingredients found in the antihistamine are relatively low.
But if you are taking Benadryl for euphoric effect, risk of Benadryl addiction increases.
We review here. However, the active ingredient in Benadryl diphenhydramine can also affect the central nervous system and has been used medically as a sleep aid and a cough suppressant. Non-medically, people may seek the significant sedative side effects of the drug and abuse Benadryl for euphoric effect. In other words, many over the counter and Rx drugs do not have euphoric effect.
But Benadryl is different. Some people can feel high on Benadryl. Diphenhydramine is a H1 receptor antagonist, which works by blocking the effect of histamine in the body and results in relief from allergy symptoms.
However, the chemical reactions that diphenhydramine trigger in the body may also other effects, including significant sedative side effects on the central nervous system. The effects of Benadryl are dose dependent and peak plasma concentrations of diphenhydramine occur hours after ingestion.
The effects of Benadryl usually last hours. Benadryl central nervous system effects include:. Benadryl is known to have adverse reactions when mixed with other medications or substances. Like other drugs, mixing diphenhydramine with alcohol can be dangerous and should be avoided can you mix Adderall and alcohol? If you take Benadryl and drink alcohol, the sleepy, drowsy, or lightheaded sensations of alcohol may be amplified…but you are at increased risk for overdose on Benadryl and can cause serious harm to yourself and others.
It is rare that people who take Benadryl as prescribed report dependence or withdrawal effects within recommended doses mg diphenhydramine every hours, not to exceed mg every hours. But you should know if you take Benadryl repeatedly, or at higher than recommended doses. In other words, you will need to take more Benadryl to achieve the same effects. But physical dependence is not the same as addiction. If you are taking Benadryl for the central nervous system effects of sedation or euphoria, you may also develop psychological dependence on diphenhydramine.
Psychological dependence on drugs is a mental obsession with your drug of choice, and craving the drug even though taking it does you harm. So, Benadryl addiction occurs when your body both develops tolerance for diphenhydramine, you go through withdrawal when you stop taking it, AND you crave Benadryl despite negative consequences drug use has brought in your life.
Diphenhydramine was first made by George Rieveschl and came into commercial use in Diphenhydramine is a first-generation antihistamine used to treat a number of conditions including allergic symptoms and itchinessthe common coldinsomniamotion sicknessand extrapyramidal symptoms.The Drug Whisperer ' The Delayed Benadryl Arrest
Diphenhydramine is effective in treatment of allergies. By injection it is often used in addition to epinephrine for anaphylaxis.
Topical formulations of diphenhydramine are available, including creams, lotions, gels, and sprays. These are used to relieve itching and have the advantage of causing fewer systemic effects e. Diphenhydramine is used to treat Parkinson's disease—like extrapyramidal symptoms caused by antipsychotics.
Because of its sedative properties, diphenhydramine is widely used in nonprescription sleep aids for insomnia. The drug is an ingredient in several products sold as sleep aids, either alone or in combination with other ingredients such as acetaminophen paracetamol in Tylenol PM or ibuprofen in Advil PM.
Diphenhydramine can cause minor psychological dependence. Diphenhydramine has also been used off prescription by parents in an attempt to make their children sleep or remain sedated on long-distance flights.
The ethics of this use have also been challenged, with the Seattle Children's hospital arguing in a article that 'Using a medication for your convenience is never an indication for medication in a child. Diphenhydramine also has antiemetic properties, which make it useful in treating the nausea that occurs in vertigo and motion sickness.
Diphenhydramine is not recommended for people older than 60 or children under the age of six, unless a physician is consulted. Topical diphenhydramine is sometimes used especially for people in hospice. This use is without indication and topical diphenhydramine should not be used as treatment for nausea because research does not indicate this therapy is more effective than alternatives.
The most prominent side effect is sedation. A typical dose creates driving impairment equivalent to a blood-alcohol level of 0. Diphenhydramine is a potent anticholinergic agent. This activity is responsible for the side effects of dry mouth and throat, increased heart ratepupil dilationurinary retentionconstipation, and, at high doses, hallucinations or delirium.
Some individuals experience an allergic reaction to diphenhydramine in the form of hives. Conditions such as restlessness or akathisia can worsen from increased levels of diphenhydramine, especially with recreational dosages. Anticholinergic use later in life is associated with an increased risk for cognitive decline and dementia among older people. Diphenhydramine overdose symptoms may include: .
Acute poisoning can be fatal, leading to cardiovascular collapse and death in 2—18 hours, and in general is treated using a symptomatic and supportive approach. Alcohol may increase the drowsiness caused by diphenhydramine. Diphenhydramine, while traditionally known as an antagonistacts primarily as an inverse agonist of the histamine H 1 receptor. It also crosses the blood—brain barrier and inversely agonizes the H 1 receptors centrally.
Like many other first-generation antihistamines, diphenhydramine is also a potent antimuscarinic a competitive antagonist of muscarinic acetylcholine receptors and, as such, at high doses can cause anticholinergic syndrome.H 1 -receptor antagonist and antihistamine with significant anticholinergic activity.
High incidence of drowsiness, but GI side effects are minor. Effects in parkinsonism and drug-induced extrapyramidal symptoms are apparently related to its ability to suppress central cholinergic activity and to prolong action of dopamine by inhibiting its reuptake and storage.
Temporary symptomatic relief of various allergic conditions and to treat or prevent motion sickness, vertigo, and reactions to blood or plasma in susceptible patients.
Also used in anaphylaxis as adjunct to epinephrine and other standard measures after acute symptoms have been controlled; in treatment of parkinsonism and drug-induced extrapyramidal reactions; as a nonnarcotic cough suppressant; as a sedative-hypnotic; and for treatment of intractable insomnia.
Hypersensitivity to antihistamines of similar structure; lower respiratory tract symptoms including acute asthma ; narrow-angle glaucoma; prostatic hypertrophy, bladder neck obstruction; GI obstruction or stenosis; pregnancy category Clactation, premature neonates, and neonates; use as nighttime sleep aid in children History of asthma; convulsive disorders; increased IOP; hyperthyroidism; hypertension, cardiovascular disease; diabetes mellitus; older adults, infants, and young children.
In common with other antihistamines, diphenhydramine should be discontinued 4 d prior to skin testing procedures for allergy because it may obscure otherwise positive reactions.