There are 4 tablespoons in a quarter cup and there are 3 teaspoons in each tablespoon; this means that there are 12 teaspoons in a quarter cup. A quarter cup is also equal to 2 fluid ounces.
In brief: Yes. Opiods have a slowing effect on gastomotility commonly causing side effects like constipation and nausea. Abrupt withdrawal of opioids from the system can cause rebound hypermotility of the GI tract which usually presents as diarrhea as well as GI spasm or craming causing abdominal pain (stomach pain).
Aspirin is well known to cause stomach bleeding. Other, related drugs such as ibuprofen, also do. They're known as non-steroidal anti-inflammatory drugs or NSAIDs. But people may not realize they'd be included in antacids and other stomach remedies sold over the counter.