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Sometimes, your immune system may react to bee venom, pollen, pet dander, or another foreign substance that usually does not cause any reaction in most people.This is when you experience allergy symptoms, such as sneezing, itchy eyes, wheezing, nasal congestion, and rash.A dissolving pill is also available for people who trouble swallowing pills.But these antihistamines are also available in liquid form.Besides, it is important to give yourself an epinephrine shot right away if you are carrying an epinephrine auto-injector.While antihistamines, like non drowsy antihistamines, work great to block the effects of histamine, you should avoid taking them if you have a metabolic disorder called acute porphyria.
It is a good idea to call your doctor if you suspect your symptoms are due to an allergic reaction.
Claritin is useful to reduce the symptoms of allergies, especially post nasal drip. Mid you are having serious allergic symptoms that worsen your asthma, see an allergist. Read more Looking at receptor inhibition profiles (lab data) we can see that some do indeed block histamine receptors.
Older ones in the tca class (elavil, anafranil, etc), trazodone and even a more modern one like Remeron (mirtazapine) do so which can lead to increased sleepiness and appetite.
In this case, your body produces histamines to fight against these substances.
Although histamine is actually a useful substance and helps clear infection, it is important to block its effects in case of allergic reactions.
Keep in mind that some other medicines can also react with antihistamines and cause certain complications.