Pharmaceutical dosage forms and methods of use

A pharmaceutical dosage form for intra-oral absorption of ecopipam, comprising ecopipam or a pharmaceutically acceptable salt thereof and a pH modifier, the pH modifier being present in amount such that the pharmaceutical dosage form has a pH of about 2 to about 4, wherein when the dosage form is in solid form, the pH is as measured after dissolving the dosage form in 30 g of artificial saliva having a pH of 6.72, wherein the pH modifier comprises one or more of citric acid, hydrochloric acid, ascorbic acid, and acetic acid or a salt thereof.