Combinations containing aspirin must meet the standards of an acceptable dissolution test, as set forth in Sec. 343.90. The following combinations are permitted: Aspirin identified in Sec. Sec. 343.12 and 343.13 may be combined with any antacid ingredient identified in Sec. 331.11 of this chapter or any combination of antacids permitted in accordance with Sec. 331.10(a) of this chapter provided that the finished product meets the requirements of Sec. 331.10 of this chapter and is marketed in a form intended for ingestion as a solution.