### drug | medication:

Antihistamine
* Every antihistamine has a different dose and risk of side effects.
* Many antihistamines are now available without a prescription
  - have the opposite effect, causing drowsiness
* Most antihistamines can cause drowsiness, while many decongestants have the opposite effect.
* Most antihistamines cause drowsiness
  - some people to become drowsy
* Some antihistamines are used in sleep aids explicitly because they cause drowsiness
  - come in candy-flavored liquids
  - have serious interactions with commonly used anti-HIV drugs
  - increase one's craving for sweets and thus help in weight gain
* act to block the allergic effects caused by the release of histamine.
* add to the effects of alcohol and other depressants.
* also can be dangerous to patients with glaucoma, an enlarged prostate, or asthma
  - cause excitement, especially in children
* also cause daytime drowsiness which can impair our performance
* appear to compete with histamine for receptor sites on effector cells
  - histamines for cell receptor sites on effector cells
* appears to be of no obvious benefit in preventing acute reactions from antivenoms.
* are also of little benefit
  - available as pills, liquids or nose sprays
  - drugs which are most effective against the symptoms of allergies
  - effective in some cases
  - either very effective or worthless
  - good at reducing the itching and sneezing that are associated with hayfever
  - helpful for treatment of procaine reactions
  - ineffective either topically or orally
  - medicines that help stop the symptoms caused by allergies
* are medicines which help against allergies
  - stop histamine from working
* are more effective if taken as soon as the allergy attack develops
  - helpful for hayfever-like symptoms
* are more likely to cause dizziness , sedation , and hypotension in elderly patients
  - dizziness, sedation and hypotension in the elderly
  - intolerable side effects in the elderly
  - most effective when used regularly rather than sporadically
* are notorious for causing decreased salivary flow
  - irregular heart beats in some patients
* are of little use
  - no benefit
* are safe during the first trimester
  - for people with asthma to use, but they can cause side effects
* are the cornerstone of urticaria management
  - main treatment for hives to reduce the allergic response
  - mainstay of treatment
  - mainstays of hay fever treatment
* are the most commonly used drug therapy
  - group of drugs for nettle rash
  - popular type of medication taken to prevent nasal allergy symptoms
  - other major class of oral medications used to treat allergic rhinitis
  - usual symptomatic treatment for itching
* are useful as second-line therapy when a prolonged course is suspected
  - in controlling urticarial lesions
* are useful in the treatment of itching in some dogs and cats
  - to control red eyes due to allergies
  - usually divide into the sedating variety and the nonsedating variety
  - very effective in acute episodes
  - widely used drugs, especially in patients with allergies
* become a popular remedy for colds and allergies.
* block histamine reactions in the body - runny nose, sneezing, watery eyes.
* block the action of histamine, a chemical that causes allergy symptoms
  - body's histamine reaction and lessen or prevent allergic reactions
  - effects of histamine, which is released during an allergic reaction
* blocks the bad effects of histamine.
* can also alleviate itching and rashes caused by food allergy.
* can also be effective, but use with certain antibiotics can cause fatal arrhythmias
  - very drying
* can also cause dry eyes
  - sleep depravation
  - slow down bile flow
* can cause drowsiness and dry mouth
  - drowsiness, nervousness and even seizures
  - dry mouth, dilated pupils, hallucinations, tremors, and convulsions
  - sleepiness
* can help control the runny nose and itchy eyes
  - ease itching
  - relieve itching and suppress hives
  - to reduce the itch and prevent scratching
  - make young children excited
  - reduce runny nose, sneezing and itchy, watery eyes
  - relieve some of the itching
  - sometimes be effective with short term itches
  - stop sneezing and itching
  - tame coughs, itchy eyes and sneezes
* clear up a runny nose and watery eyes.
* come in pill, liquid or nasal spray form
  - tablet, liquid, or capsule form, and are available without a prescription
* constitute a large number as they enhance the effect of opioids.
* do little good.
* dominate the market.
* don t touch the underlying cause, they just suspend the body s ability to respond.
* drops temporarily relive symptoms.
* dry the nasal secretions somewhat.
* dry up mucous
  - secretions of the respiratory tract and can minimize allergy symptoms
* enter popular use for treatment of allergies and head-colds.
* generally dry up nasal secretions.
* give some relief.
* given by mouth are also quite effective in reducing itch.
* have a drying effect and alleviate nasal stuffiness
  - limited role in treating nonallergic rhinitis syndromes
* have a potential for sedation causing grogginess after use
  - grogginess and dryness after use
  - little or no use in treating cough
  - no proved benefit
* help dry a runny nose and watery eyes
  - prevent the allergic reaction and thus symptoms
  - reduce the sneezing, runny nose and itchiness of allergies
  - relieve the sneezing and runny nose of allergy
* increase the effects of alcohol and other depressants.
* interfere with brain activity, causing drowsiness and depression.
* just mask symptoms and make the diagnosis problem worse.
* make a good sleep aid for people with occasional insomnia.
* merely block the action of histamine at receptor sites.
* occasionally help.
* offer fast relief from sneezing, runny nose, and itchy, watery eyes.
* often give good relief from symptoms.
* only cure sinusitis on television, or when it is due to allergic rhinitis.
* overdose in young children can lead to convulsions and death.
* prevent the release of histamine, an endogenous mediator that worsens the itch.
* provide varying degrees of relief and are available in eyedrops and oral formulas.
* reduce itching and swelling and dry up secretions from the eyes, nose, and throat
  - up secretions from the nose, eyes, and throat
  - sneezing, runny nose, and itchy eyes, nose, and throat
  - swelling in mucous membranes and soft tissues
  - the symptoms by blocking the effects of histamine
* relieve itching and can be used as required
  - tearing by blocking the action of histamine
  - redness, inflammation, itchiness, and watery eyes
  - runny noses while decongestants open clogged nasal passages
* remain the cornerstone for the treatment of allergic rhinitis
  - gold standard for treatment of allergies
* reverse blood-ocular barrier permeability in experimental diabetes
  - many of the symptoms of the syndrome
* seem effective in some cats
  - to help some cats even when the problem seems to be psychogenic
* specifically treat reaction to allergens such as pollen, molds and dust.
* stop the release of histamine from mast cells.
* taken before exercise can prevent the reaction.
* tend to cause drowsiness , while decongestants tend to keep people awake.
* treat itchy, watery, red eyes, sneezing, runny nose and itchy throat and mouth
  - the itching, sneezing and discharge
* usually work well for sneezing and itchy eyes, throat and nose.
* work best for itching
  - if taken on a regular schedule to prevent hives from forming
  - when taken during the first day or two of a cold
* work by blocking the action of histamine at histamine receptors
  - effect of histamine
  - release of histamines that bring on the allergy symptoms
  - preventing the effects of histamine
  - in a completely different way
  - to releive the symptoms of allergic rhinitis
+ Adverse effect (medicine), Examples of adverse effects associated with specific medications: Medicine