Allergic responses to cyclopentolate are even less common than to atropine and cyclopentolate may be used in patients who are allergic to atropine . The risk of a rise in intraocular pressure following the use of cyclopentolate is lower than with atropine because of the less drastic effects and the shorter duration of action. It is also easier to reverse the effects of cyclopentolate if this is thought to be desirable.