Morphine is known to cause alergic reactions in many cases similar to that of its derivative called codeine. Morphine or codeine is generally used as the most powerful pain killer dose which is normally administered after the surgical operation or the serious injury.

Morphine dose can relieves the patient faster from the killing pains. Morphine is found to react in the patients especially whose parents had any allergic reactions to morphine or any of its derivatives like codeine. This may be termed as the hereditary alergic symptoms.

Morphine is considered as extremely powerful for headaches and menstrual period pains. However, the allergic reactions to any medications do not occur on the very first exposure to it but can occur even with little amounts of the medication at any subsequent exposure. Same is the case of morphine; the allergic reactions do not exhibit immediately with this medication.