In this photo taken Thursday, Nov. 7, 2019, workers wearing protective clothing to protect from the effects of the drug and to prevent contamination, make liquid morphine from powder which is dyed green as a color-code to indicate the strength, at the Pharmaceutical Laboratory of Rwanda in Butare, Rwanda. While people in rich countries are dying from overuse of prescription painkillers, people in Rwanda and other poor countries are suffering from a lack of them, but Rwanda has come up with a solution to its pain crisis – it’s morphine, which costs just pennies to produce and is delivered to households across the country by public health workers. (AP Photo/Ben Curtis)

BUSHEKELI, Rwanda — It was something, the silence. Nothing but the scuff of her slip-on shoes as Madeleine Mukantagara walked through the fields to her first patient of the day. Piercing cries once echoed down the hill to the road below. What she carried in her bag had calmed them.

For 15 years, her patient Vestine Uwizeyimana had been in unrelenting pain as disease wore away her spine. She could no longer walk. Her life narrowed to a dark room with a dirt-floor in rural Rwanda, prayer beads hanging on the wall by her side.

A year ago, relief came in the form of liquid morphine, locally produced as part of Rwanda’s groundbreaking effort to address one of the world’s great inequities: As thousands die from addiction in rich countries awash with prescription painkillers, millions of people in the poorest nations have no access to opioids at all.

Companies don’t make money selling generic morphine to the dying, and most in sub-Saharan Africa cannot afford the expensive formulations like oxycodone, prescribed so abundantly in richer nations that thousands became addicted to them.

Rwanda’s answer: plastic bottles of morphine, produced for pennies and delivered to homes across the country by health workers like Mukantagara. It is proof, advocates say, that the opioid trade doesn’t have to be guided by how much money can be made.