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Medication	Crystal Description
AcyclovirAcyclovir	Birefringent, needle-shaped May be free or engulfed in leukocytes
AmpicillinAmpicillin	Needle-shaped Best seen under polarized light
IndinavirIndinavir	Starburst-shaped or individual needle-shaped crystals Best seen under polarized light
MethotrexateMethotrexate	Golden brown clumps Birefringent under polarized light
Sulfonamides	Needle-shaped or fan-shaped; may cluster Best seen under polarized light