Conclusions
Hydroxyzine is a medication used to treat itchiness, and anxiety. It inhibits the effects of histamines. Like every medication, it has its side effects, which can be mild or severe. You must speak with your doctor or pharmacist about any underlying condition or any drug you are taking.
References
[1] https://www.parkinson.org/understanding-parkinsons/symptoms/movement-symptoms/tremor
[2] https://my.clevelandclinic.org/health/diseases/17179-liver-disease
[3] https://www.mayoclinic.org/diseases-conditions/hyperthyroidism/symptoms-causes/syc-20373659
[4] https://www.mayoclinic.org/diseases-conditions/chronic-kidney-disease/symptoms-causes/syc-20354521
[5] https://www.nhs.uk/conditions/stomach-ulcer/
[6] https://www.heart.org/en/health-topics/arrhythmia/about-arrhythmia/bradycardia–slow-heart-rate