hmm, it's true that some of the drugs have been replaced by medications with better efficacy and lower side effects, but they're not entirely obsolete.

Take hydralazine and procainamide, for instance. Though they are no longer recommended as first-line therapy, they are still prescribed in certain cases. For example, hydralazine is still given to patients with resistant hypertension, and procainamide is used for tachycardia in emergencies. I've included the references below in case you're interested in taking a look.

References:

1. https://www.ahajournals.org/doi/10.1161/HYP.0000000000000084 [On hydralazine]

2. https://cpr.heart.org/en/resuscitation-science/cpr-and-ecc-guidelines/algorithms [On procainamide: Refer to Adult Tachycardia With a Pulse Algorithm]