The best replacement for im injection is iv.

The best alternatives to im injection are rated as following:
★★★★★  iv
★★★★  sub q injection

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Speaking about im injection, one probably shouldn't forget about blood return.

Other search terms related to im injection and their ratings are:
★★★★★ blood return
★★★★ aspiration
★★ 1/2 inch needle
★ air bubble
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Google Trends

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im injection
iv
sub q injection