Yes, it is normal to have shoulder pain with pericarditis. Shoulder pain can sometimes be a symptom of pericarditis due to the inflammation affecting nearby nerves. It is always best to consult with your doctor for personalized advice and guidance on managing your symptoms. Taking Tylenol for shoulder pain should not interfere with your current medication regimen, but it is important to avoid taking additional over-the-counter pain relievers that contain anti-inflammatory ingredients.