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Activity Ratio of Histamine and Pyridylethylamine as Measured in 2 + 2 Assays Before and After Addition of Diphenhydramine Using the Guinea-Pig Ileum
| No. of Expt. | Activity Ratio Before Diphenhydramine | Activity Ratio in Presence of Diphenhydramine (1: 300 × 104) |
|---|---|---|
| 1 | 48 | 57 |
| 2 | 39 | 43 |
| 3 | 28 | 31 |
| 4 | 46 | 46 |
| 5 | 40 | 41 |
| 6 | 65 | 65 |
