Difference between injectables and meds

Meira

Hey ladies. Can anyone give me info about the difference between getting injectables for <a href="https://glowing.com/glow-fertility-program">IUI</a> vs Letrozole? I had 3 mature follicles with Letrozole this cycle. Would taking injectables make the <a href="https://glowing.com/glow-fertility-program">IUI</a> more likely to take? Or do they just increase egg production?