Declension table of ?prahantavya

Masculine	Singular	Dual	Plural
Nominative	prahantavyaḥ	prahantavyau	prahantavyāḥ
Vocative	prahantavya	prahantavyau	prahantavyāḥ
Accusative	prahantavyam	prahantavyau	prahantavyān
Instrumental	prahantavyena	prahantavyābhyām	prahantavyaiḥ prahantavyebhiḥ
Dative	prahantavyāya	prahantavyābhyām	prahantavyebhyaḥ
Ablative	prahantavyāt	prahantavyābhyām	prahantavyebhyaḥ
Genitive	prahantavyasya	prahantavyayoḥ	prahantavyānām
Locative	prahantavye	prahantavyayoḥ	prahantavyeṣu

Compound prahantavya -

Adverb -prahantavyam -prahantavyāt