Breaking printed letters

Question

I take a daily medication (a pill) that comes in an aluminum card. The name of the medication and/or the drug company is printed on the foil. When I push the pill through the aluminum, it definitely breaks letters. It is not my specific intention to break the letters, all I want is the medication. Is this permissible to do on Shabbos? I assume that is a case of p'sik raisha. Thank you, and k'siva v'chasima tovah.