[Table/Fig-6]:
Drug pair showing pharmacodynamic antagonism
| Drug pair | Frequency |
| Aspirin- Atenolol | 28 |
| Aspirin-Enalapril | 26 |
| Metformin- Hydrochlorothiazide | 24 |
| Aspirin-Metoprolol | 21 |
| Aspirin-Frusemide | 18 |
| Aspirin-Ramipril | 11 |
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