ARYMO ER (morphine sulfate) extended-release tablets are for oral use and contain morphine sulfate, an opioid agonist.
Each tablet contains the following inactive ingredients common to all strengths: polyethylene oxide 400,000, butylated hydroxytoluene, polyvinyl alcohol, polyethylene glycol 3350, talc, and titanium dioxide.
The tablet strengths describe the amount of morphine per tablet as the pentahydrated sulfate salt (morphine sulfate).
The 15 mg tablets also contain: FD&C Blue No. 2 and ferric oxide yellow.
The 30 mg tablets also contain: ferric oxide red, FD&C Blue No. 2, and ferrosoferric oxide.
The 60 mg tablets also contain: ferric oxide yellow, and ferric oxide red.
Morphine sulfate is an odorless, white crystalline solid with a bitter taste. It has a solubility of 1 in 21 parts of water and 1 in 1000 parts of alcohol, and practically insoluble in chloroform or ether. The octanol:water partition coefficient of morphine is 1.42 at physiologic pH and the pKa is 7.9 for the tertiary nitrogen (mostly ionized at pH 7.4). Its structural formula is: