For CV19, right now IV is the only way to administer it.
Down the road, who knows? Maybe a nasal spray/nebulier delivery system.
For OM, a sachet swish and spit delivery system.
For post-stomach GI tract, a pill delivery system.
For pulmonary conditions, hopefully a spray right into the lungs.
For eye/ear/other conditions, maybe liquid applied by drops.
Lots of options, lots of indications, many answers still unknown.