wordpress remove Mandrill widget from dashboard

_functions.php

<?php
// Remove Mandrill Dashboard Widget
// http://wordpress.org/support/topic/dashboard-widget?replies=3
function sp_remove_wpmandrill_dashboard() {
	if ( class_exists( 'wpMandrill' ) ) {
		remove_action( 'wp_dashboard_setup', array( 'wpMandrill' , 'addDashboardWidgets' ) );
	}
}
add_action( 'admin_init', 'sp_remove_wpmandrill_dashboard' );