antihistamine. Antihistaminic Pharmacology An agent that counteracts the effects of histamine released during allergic reactions by blocking histamineâH 1 receptors Adverse effects Dry mouth, drowsiness, urine retention in â, tachycardia.hile the term antihistamine can broadly include any agent that blocks any histamine receptor, in practice it is usually used to denote those blocking the H 1 type of receptors (H1 receptor antagonists), those involved in allergic reactions.
While all of these Military service branches are uniformed, have. weapons, ranks and other such details that are. similar, the specific missions and focus of. each service is quite different. The US Army is charged as the primary land. combat force.
5th Special Forces Group (United States) The 5th Special Forces Group (5th SFG(A)) is one of the most decorated active duty United States Army Special Forces group in the U.S. armed forces. The 5th SFG(A) saw extensive action in the Vietnam War and played a pivotal role in the early months of Operation Enduring Freedom. As of 2016, the 5th SFG is primarily responsible for operations within the CENTCOM area of responsibility as part of the Special Operations Command, Central (SOCCENT).