Declension table of ?siddhadravya

Neuter	Singular	Dual	Plural
Nominative	siddhadravyam	siddhadravye	siddhadravyāṇi
Vocative	siddhadravya	siddhadravye	siddhadravyāṇi
Accusative	siddhadravyam	siddhadravye	siddhadravyāṇi
Instrumental	siddhadravyeṇa	siddhadravyābhyām	siddhadravyaiḥ
Dative	siddhadravyāya	siddhadravyābhyām	siddhadravyebhyaḥ
Ablative	siddhadravyāt	siddhadravyābhyām	siddhadravyebhyaḥ
Genitive	siddhadravyasya	siddhadravyayoḥ	siddhadravyāṇām
Locative	siddhadravye	siddhadravyayoḥ	siddhadravyeṣu

Compound siddhadravya -

Adverb -siddhadravyam -siddhadravyāt