Possible Clues:

• To treat Pa in, pairs in a pill
• Hoping endlessly to find effective analgesic
• No good for a pain in the neck, but all right for a pain in the head
• Endlessly hoping to acquire analgesic
• Painstaking preparation?
• Drug once derived from willow bark
• Endlessly yearning for pain relief
• Pain-killer
• Hoping to detail pain killer
• Almost hopeful concerning pain reliever