Praise be to Allaah.
Islam encourages us to have many children, and the Prophet of
Allaah Shu’ayb (peace be upon him) reminded (his people) of this blessing
and said to them: “And remember when you were but few, and He multiplied
you” [al-A’raaf 7:86]. And it was narrated from Ma’qil ibn Yasaar (may
Allaah be pleased with him) that the Prophet (peace and blessings of
Allaah be upon him) said: “Marry those who are loving and fertile, for I
will be proud of your great numbers before the nations.” Narrated by Abu
Dawood, 2050; classed as saheeh by al-Albaani. See also question no.
13492.
Being sterilized permanently may mean one of two things:
1 – It may be done out of necessity, such as if it is
determined by trustworthy medicinal evidence that pregnancy will pose a
danger to the mother’s life, and there is no hope of a cure, so permanent
sterilization will ward off that danger. In this case it is permissible to
be sterilized.
2 – When there is no need for it. Undoubtedly in this case it
is a criminal act and a major sin, because it is a transgression against the
creation of Allaah for no reason, and preventing the production of offspring
which was encouraged by the Prophet (peace and blessings of Allaah be
upon him), and being ungrateful for the blessing of children which Allaah
bestows upon His creation.
It says in al-Insaaf: It says in al-Faa’iq: And
it is not permissible to do anything that will put a stop to pregnancy.
(1/383).
The Islamic Fiqh Council stated the following in its report
no. 39 (1/5):
It is haraam to sterilize both men and women, if there is no
necessary reason for doing so unless there is a necessity which is to be
determined according to the guidelines set out by sharee’ah. It is
permissible to take temporary measures to space pregnancies or prevent them
for a limited period of time, if there is a legitimate shar’i need to do so,
so long as this decision is made on the basis of mutual consultation and
approval between the spouses. That is subject to the condition that no harm
should result from that, and that the means should be acceptable according
to sharee’ah, and that there should be no harm caused to an existing
pregnancy. End quote.
Based on this, if
your preventing pregnancy is for a legitimate reason as outlined above, then
you do not have to do anything. But if it was not for a necessary reason,
then you have done something which is haraam, and you have to repent
sincerely to Allaah and stop taking these injections immediately. If there
is anything that will reverse their effect without causing harm, then you
must take it. And Allaah knows best.