The Customers can cancel the order for the product till Acerus Pharma shipped it. Order once shipped cannot be cancelled. # ACERUS PHARMA CANCELLATION” There may be certain orders that Acerus partners are unable to accept and services & these may need to be cancelled. Some other situations that may result in your order being cancelled includes, non-availability of the products or quantities ordered by you or inaccuracies or errors in pricing information specified by our partners..