• 黑(black; dark color (depicting a face blackened by smoke and fire))

A face covered by smoke and fire symbolizes the dark black color.

• 火(fire (pictographic))

The character 火 depicts a flame bursting with fire sparks radiating out on both sides.

• 艹(grass; plant)
• 约(promise; bind)

Medicine is made from grass and plants, sounding like "wish" or "promise".

• 黑(black; dark color (depicting a face blackened by smoke and fire))

A face covered by smoke and fire symbolizes the dark black color.

• 火(fire (pictographic))

The character 火 depicts a flame bursting with fire sparks radiating out on both sides.

• 艹(grass; plant)
• 约(promise; bind)

Medicine is made from grass and plants, sounding like "wish" or "promise".