To answer your actual question, Ellen:
Humanae Vitae 15: On the other hand, the Church does not consider at all illicit the use of those therapeutic means necessary to cure bodily diseases, even if a foreseeable impediment to procreation should result there from—provided such impediment is not directly intended for any motive whatsoever.
This is an application of the Principle of Double Effect in the case of treatments that render one infertile either temporarily or permanently.
The Principle of Double Effect does not, however, give one carte blanche to act. One must meet all of the criteria.
- The object of the act must be a good action judged by its moral object (in other words, the action must not be intrinsically evil);
- The direct intention of the agent must be to achieve the beneficial effects and to avoid the foreseen harmful effects as far as possible, that is, one must only indirectly intend the harm;
- The foreseen beneficial effects must not be achieved by the means of the foreseen harmful effects, and no other means of achieving those effects are available;
- The foreseen beneficial effects must be equal to or greater than the foreseen harmful effects (the proportionate judgment);
- The beneficial effects must follow from the action at least as immediately as do the harmful effects.
Therefore, under the Principle of Double Effect there may be times when the contraceptive effect can be tolerated.
There are times when even the
possible (although by no means certain) abortifacient effect can be tolerated. Yes, the hormonal pill
might create an inhospitable uterus. That is not certain. In the case in which there is a *proportionate reason *to treat a disease by means of these hormones-- or ANY hormones, surgery, or other process (radiation for example)-- the person may do so.
For a non-hormonal pill example of Double Effect, St Gianna Molla *could have *legitimately chosen treatment for her uterine cancer-- which would **certainly **have had the effect of killing her unborn child-- under the Principle of Double Effect. She chose heroic virtue in foregoing the medical procedure. But she was not required to do so.