Declension table of ?prathayitavya

Neuter	Singular	Dual	Plural
Nominative	prathayitavyam	prathayitavye	prathayitavyāni
Vocative	prathayitavya	prathayitavye	prathayitavyāni
Accusative	prathayitavyam	prathayitavye	prathayitavyāni
Instrumental	prathayitavyena	prathayitavyābhyām	prathayitavyaiḥ
Dative	prathayitavyāya	prathayitavyābhyām	prathayitavyebhyaḥ
Ablative	prathayitavyāt	prathayitavyābhyām	prathayitavyebhyaḥ
Genitive	prathayitavyasya	prathayitavyayoḥ	prathayitavyānām
Locative	prathayitavye	prathayitavyayoḥ	prathayitavyeṣu

Compound prathayitavya -

Adverb -prathayitavyam -prathayitavyāt