Yes, loose motions can be a side effect of your medications, especially Pacinac-NP, as pain relievers can irritate the digestive tract. However, experiencing diarrhea for 11 days is concerning and risks severe dehydration. You should consult your doctor immediately to discuss safely stopping or replacing these medicines. Do not self-medicate with anti-diarrheal or antibiotic pills without a physical evaluation, as this could also be a gastrointestinal infection. For now, focus on staying hydrated by drinking plenty of water and Oral Rehydration Solutions (ORS). Please see a healthcare professional promptly for an accurate diagnosis and appropriate treatment.