Description: Segment 1 Professor Black introduces the lecture. He gives a brief history of the discovery of histamine H2-receptor antagonist medications and shows a table detailing the properties of antihistamine drugs. He shows a further table detailing the patterns of different hormone responses to various antihistamine medications. Time start: 00:00:00:00 Time end: 00:05:43:00 Length: 00:05:43:00 Segment 2 Black continues to refer to the table listing different hormonal responses to antihistamine medications. He runs through the properties and effects of each drug in detail. He then shows an illustration of the chemical properties of various antihistamines. Time start: 00:05:43:00 Time end: 00:10:40:00 Length: 00:05:57:00 Segment 3 Black continues to compare antihistamine medications. He plots their effectiveness on a graph which takes into account dose ratio and response. Time start: 00:10:40:00 Time end: 00:17:06:00 Length: 00:06:26:00 Segment 4 Black refers to graphs and tables charting dose ratio to response statistics of different antihistamine agents. He gives examples of various pharmacological studies on each of the drugs. He hands over to White. Time start: 00:17:06:00 Time end: 00:21:09:00 Length: 00:04:03:00 Segment 6 Wyllie discusses the effects of antihistamine medications on the vagus nerve. he then describes the results of a test of the drug metiamide to treat duodenal ulcer he refers to a graph which shows the rates of ulcer healing due to this medication. After that, Wyllie shows the same tables but this time relating to cemitidine. He concludes by saying that, of the two, cemitidine is probably the more effective for future development. Time start: 00:28:29:00 Time end: 00:37:17:15 Length: 00:09:12:15