Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, treating addiction, reversing opioid overdose, suppressing cough, and suppressing opioid induced constipation.
Other foods that are high in calcium include: 1  Spinach. 2  Kale. 3  Okra. Collards. 4  Soybeans. White beans.  Some fish, like sardines, salmon, perch, and rainbow 1  trout. Foods that are calcium-fortified, such as some orange juice, oatmeal, and breakfast  cereal.
Dark greens and broccoli are also good sources, but to get your daily allowance, you'd have to eat between 6 and 20 cups of them. Finally, if you do opt for a calcium supplement, a reasonable dose would be 500 mg per day in divided doses of calcium citrate, which is more easily absorbed than other forms of calcium.