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.
Find Your Local Recruiter Here For All Military Branches! Start by understanding the service options, their area of operation, their missions and their us military job offerings. Service Options Five primary component branches comprise the United States armed forces. All are within the Department of Defense except the Coast Guard which is within the Department of Homeland Security. During time of war or national emergency, the Coast Guard functions as a specialized service under the Navy.