you could add Restrict content Validation to the review field to restrict words such as cialis or viagra.
In the server behaviors anel, double click the Server Validations server behavior. From the validations type list select restrict content. Click the Lightning bolt next to server variable and select the reviews form element. Then click the plus button to add it to the list of validations. this will bring up a window where you can add content to restrict. Add any words you dont want to allow people to post such as Viagra.