Company: IXHL
Filing Date: 2025-05-16
Form Type: DEFA14A
Source: 0001213900-25-044454
Chunk: 9

Company: Incannex Healthcare Inc.
Filing Date: 2025-05-16
Form: DEFA14A
Chunk 9
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 original party hereto.

The Company acknowledges and
agrees that, except for the waivers, consents and agreements set forth above, the surviving obligations under the Registration Rights
Agreement, Series A Warrant and the Purchase Agreement remain unmodified and in full force and effect.

<div align='center'>[Signature Pages Follows]

2</div>

| Very truly yours, |
| [●]               |
| By:               |
| Name:             |
| Title:            |

<div align='center'>Signature Page to Letter Agreement</div>

| Acknowledged and accepted: |                                                |
| INCANNEX HEALTHCARE INC.   |                                                |
| By:                        |                                                |
| Name:                      | Joel Latham                                    |
| Title:                     | Chief Executive Office, President and Director |

<div align='center'>Signature Page to Letter Agreement

Exhibit A

Wire Instructions</div>