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2. H1 antagonist - Wikipedia

   en.wikipedia.org/wiki/H1_antagonist

   H 1 antagonists, also called H 1 blockers, are a class of medications that block the action of histamine at the H 1 receptor, helping to relieve allergic reactions.Agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines; other agents may have antihistaminergic action but are not true antihistamines.

3. H3 receptor antagonist - Wikipedia

   en.wikipedia.org/wiki/H3_receptor_antagonist

   An H 3 receptor antagonist is a type of antihistaminic drug used to block the action of histamine at H 3 receptors.. Unlike the H 1 and H 2 receptors which have primarily peripheral actions, but cause sedation if they are blocked in the brain, H 3 receptors are primarily found in the brain and are inhibitory autoreceptors located on histaminergic nerve terminals, which modulate the release of ...

4. Hydroxyzine - Wikipedia

   en.wikipedia.org/wiki/Hydroxyzine

   Hydroxyzine works by blocking the effects of histamine. [9] It is a first-generation antihistamine in the piperazine family of chemicals. [8] [4] Common side effects include sleepiness, headache, and dry mouth. [8] [9] Serious side effects may include QT prolongation. [9] It is unclear if use during pregnancy or breastfeeding is safe. [8]

5. What you need to know about over-the-counter birth control

   www.aol.com/lifestyle/know-over-counter-birth...

   Side effects can also vary by medication and, if a person has side effects with one OTC emergency contraception pill, that person may do better with another, Wider says. "So more options are ...

6. Can birth control cause a stroke? Little-known side effect ...

   www.aol.com/birth-control-cause-stroke-little...

   The estrogen in some birth control causes the liver to produce more of a protein that helps the body clot blood, said Dr. Shaila Patel, an obstetrician gynecologist at St. David's Women's Center ...

7. Chlorphenamine - Wikipedia

   en.wikipedia.org/wiki/Chlorphenamine

   It is a first-generation antihistamine and works by blocking the histamine H 1 receptor. [2] Common side effects include sleepiness, restlessness, and weakness. Other side effects may include dry mouth and wheeziness. [2] Chlorpheniramine was patented in 1948 and came into medical use in 1949. [3] It is available as a generic medication and ...