Postinor 2 effectiveness, if both pills are taken at

Patient: I asked my Pharmacist for Postinor, she gave me Postinor 2. She told me my gf can take both pills at once, to reduce side-effects. Does Postinor 2 still work and prevent preg.. if it is taken in that manner? She took the pills with 45hours remaining.Thank you in advance.

Doctor: