Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with medicine) An injection in a dream indicates goodness and benefit that comes quickly. If it is painful, it is a benefit with fatigue.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) An injection indicates the fulfillment of a need or recovery from illness.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) An injection is interpreted as goodness. Whoever sees himself receiving one will attain goodness.