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2. Histamine intolerance - Wikipedia

   en.wikipedia.org/wiki/Histamine_intolerance

   Additional options in histamine intolerance include antihistamines, mast cell stabilizers, and supplementation with exogenous diamine oxidase (DAO supplementation in the form of capsules or tablets), however, there is no solid research to validate the effectiveness of these additional treatment options in histamine intolerance. [6] [20] [21]

3. H1 antagonist - Wikipedia

   en.wikipedia.org/wiki/H1_antagonist

   Infrequent adverse effects include urinary retention, palpitations, hypotension, headache, hallucination, psychosis and erectile dysfunction. [4] [6] [7] The newer, second-generation H 1-antihistamines are far more selective for peripheral histamine H 1-receptors and have a better tolerability profile compared to the first-generation agents ...

4. 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 ...

5. Cluster headache - Wikipedia

   en.wikipedia.org/wiki/Cluster_headache

   Cluster headaches may occasionally be referred to as "alarm clock headache" because of the regularity of their recurrence. Cluster headaches often awaken individuals from sleep. Both individual attacks and the cluster grouping can have a metronomic regularity; attacks typically strike at a precise time of day each morning or night.

6. Cetirizine - Wikipedia

   en.wikipedia.org/wiki/Cetirizine

   The medication works by blocking histamine H 1 receptors, mostly outside the brain. [6] Cetirizine can be used for paediatric patients. The main side effect to be cautious about is somnolence. [9] It was patented in 1983 [10] [11] and came into medical use in 1987. [12] It is on the World Health Organization's List of Essential Medicines. [13]

7. 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]