Green’s Dictionary of Slang

1. heroin in tablet form.

1933		D. Maurer ‘Junker Lingo’ in AS VIII:2 27: Heroin, represented by H., is known as courage pills when it is prepared in tablet form.
1949		Monteleone Criminal Sl. (rev. edn).
1959		J.E. Schmidt Narcotics Lingo and Lore.
2001		ONDCP Street Terms 6: Courage pills — Heroin.

2. any form of anti-depressant.

1969		R.R. Lingeman Drugs from A to Z (1970) 71: courage pills barbiturates or other sedative pills.
1977		L. Young et al. Recreational Drugs.