Possible Clues:

• Analgesic
• That's Father in with the murderer for some aspirin
• Analgesic drug
• Drug for each receiving a tattoo, feeling queasy
• Healthy condition? Not so healthy when swallowing a soothing drug
• Opiate, e.g.
• Morphine, e.g.
• A pinker drunk, unwell inside, gets the medicine
• Old man's ailing more having swallowed liquid form of medicine
• One shouldn't feel hurt when it's used