Take Drug → to Interfere with the marital act / Prevent Pregnancy → to Avoid Medical Risks.
And the contrary argument:
Actually, it should read:
“Take Drug - To Avoid Stroke, Heart Attack, Post-Partum Depression, Suicide, Serious Medical Injury, Death - Secondarily, Pregnancy Avoided.”
The wife wants children if death would not result. She is not using contraception nor undergoing a tubal ligation for selfish, self-interest, nor material reasons.
The whole point of the Church’s teaching against contraception is to promote the growth of the family unit. As it stands right now, she can no longer have children as pregnancy is a death wish. She is only pursuing these routes to avoid her own demise.
How can one advocate that one may use contraceptives “for medical reasons” to avoid rather trivial illnesses, even “acne”, but you cannot use it to avoid the more grave medical conditions of stroke, heart attacks, suicide, even death that would surely result from a pregnancy? The logic does not follow.
If we follow your logic, the wife would be left with no other choice aside from abstinence. This runs contrary to Church teaching as well. A marriage is the spiritual, mental, psychological, and (yes) sexual union of souls, male and female. The husband and wife become one. They are obligated to each other.
To deny the wife the ability to express her love to her husband would be issuing the verdict of separation most assuredly leading to divorce, to the complete detriment of the family, leading to further negative consequences: the break-up of the family, the negative effect on the family members (including young children), depression, anxiety, turmoil, even suicide.
How would advice leading to divorce and its demonstrably family-destroying results be considered charitable? The Church does not advocate nor promote divorce.
Approaching these matters from a legalistic twisting and turning of the Catechism denies the spirit of the Catechism as well as Christ’s message of love and compassion. It’s not unlike the accusation Christ made against the Pharisees for their legalistic twisting of Mosaic Law to suit their own self-interests, contrary to the Creator’s intentions. These matters simply cannot be viewed in a vacuum. Even in legal matters, there are multiple arguments and opinions regardless of the stated law. What you have done here is taken a portion of the Catechism and issued an all-encompassing edict that does not necessarily apply to this particular circumstance. Nor does your interpretation take into account the complexities and complications of the situation.
Compassion for the wife, as well as quality advice from a competent priest is the correct and proper alternative.