Exhibit 31.1
CERTIFICATION
I, Jonah Shacknai, certify that:
| 1. | I have reviewed this annual report on Form 10-K of Medicis Pharmaceutical Corporation; | ||
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
| Date: October 28, 2005 | ||
| JONAH SHACKNAI | ||
| /s/ JONAH SHACKNAI | ||
| (Jonah Shacknai) | ||
| Chairman of the Board and | ||
| Chief Executive Officer |