They are very similar. Both belong to the same drug class: Ophthalmic anesthetics.
Proparacaine drops is a topical local anesthetic. It works on the nerves to decrease pain.
Read more at: https://www.drugs.com/cdi/proparacaine-drops.html
Tetracaine drops is an anesthetic. It works by blocking nerve impulses, which results in loss of feeling.
Read more at: https://www.drugs.com/cdi/tetracaine-drops.html
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