That Naughty Little Pill: Birth Control Side Effects

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Are You On the Pill?

It was early in my actualization as a righteous, post-adolescent that I began to think of birth control as a woman's right. It would be years before I would learn the nuanced considerations of tacit permissiveness for unprotected sex, the wholesale delegation of contraception to the female counterpart, and the fundamental divorce of a woman from the very feedback systems that fire up her reproductive vitality.

These concerns colored my perception of this gift from Pharma, well before I began to learn about functional biochemical concerns surrounding the metabolism of synthetic hormones. With over 100 million women using this form of hormonal suppression worldwide, I have to wonder how many of them have any exposure to information about the Pill's subtle but important perturbations to the system, not to mention the consensus risks of thromboembolism, hypertension, cerebrovascular events, gallstones, and cancer?

As notorious as our hormones are for wreaking havoc, they are what pop us into high relief - they excite us, move us, drive us and enliven us. The non-linear relationships between sex hormones, thyroid hormone, and adrenal hormones is like the magic of 3-D glasses: if you cover one lens, things just don't look as exciting.

When patients come to me with complaints of low libido, low or flat mood, weight gain, hair loss, and cloudy thinking, one of my first questions is, "Are you on the Pill?" When they complain about premenstrual irritability, insomnia, tearfulness, bloating, and breast tenderness, requesting that I sanction a course of oral contraceptives combined with an antidepressant, I tell them there's a better way.

What the Studies Show

The signs of hormonal imbalance are often dismissed by doctors as a problem too complex to rectify. In my practice, I look at diagnostics to personalize dietary recommendations, targeted nutritional interventions, and herbal options, to promote the body's own drive toward harmony.

If it's not enough to shoot for an optimally functioning hormonal system and they also want to preserve their right not to have a fertilized egg, then I recommend a non-hormonal IUD, nifty gadgets like the Daysy, or the good, old-fashioned condom.

Why do I think that turning a woman into a 2-dimensional version of her hormonal self is such a big deal? If she's in my office, she is someone who has struggled with mood swings and anxiety. The last thing she should be doing is stacking the cards against her recovery with synthetic hormones and the pharmacologic burden they bring.

Since the 1960s, there has been controversy surrounding the potential mood effects of oral contraceptives, but more than 50 years of use has not settled this question.

There is acknowledgement that depression is the most common reason for discontinuation of use. I don't need pilot studies that demonstrated women using the combined oral contraceptive pill were significantly more depressed than a matched group who did not, to persuade me because I see it first hand, most notably, in those who begin contraception (hormonal IUD, progestin-only, or combined) postpartum.

The data is compromised by inconsistent assessments of mood pathology across the cycle and between groups, and often by study design, but suggests overall that there is a subset of women for whom oral contraceptives represent a major risk factor for depression and/or related mood disturbance.

Who might these women be? From 13 prospective trials, it appears that they have a personal or family psychiatric history (who doesn't?), one that has been exacerbated by pregnancy/postpartum, and premenstrual periods, and young age. More specifically, women with premenstrual mood symptoms prior to use experience more adverse effects with lower progestin dosages or triphasic OCs, unlike women without this history who experience more psychiatric side effects with higher progestin preparations.

The Link Between Birth Control & Depression

Could these side effects be just coincidence? Could they represent "confounding by indication" or the fact that many women who opt to suppress their cycle might already be prone to depression? It's possible, but so are some of these important mechanistic insights:

Synthetic hormones like those in combined oral contraceptives increase thyroid and sex hormone binding globulin, effectively decreasing the available testosterone and thyroid hormone in circulation (which can render you of nun-like libido, and functionally hypothyroid or depressed, constipated, overweight, cloudy, with dry skin and hair, to boot!). A randomized, open-label, 9 week trial of 3 forms of hormonal contraception found that they all increased SHBG, as well as insulin resistance, and markers of inflammation such as c-reactive protein. Another study suggests that increases in SHBG may persist long after discontinuation of the Pill contributing to sexual dysfunction/low libido. Incidentally, xenoestrogens such as PCBs, BPA, and pthalates, as well as poor excretion of estrogen as occurs with gut dysbiosis, can also contribute to elevated SHBG and lead to undesirable states of "estrogen dominance".

Oral contraceptives promote oxidative stress. Stress is often defined as the inability to cope with demands, and oxidative stress is a destructive force in the body perpetuated by reactive oxygen species that outnumber available antioxidant enzymes and factors. One measure of oxidative stress, lipid peroxidation, was found to be higher in those taking OCs, and improved (not quite to baseline controls) when they were treated with vitamins E and C, known antioxidants.

Oral contraceptives deplete vitamins, minerals, and antioxidants as measured by activity of Coenzyme Q10, vitamin E, and Total Antioxidant Activity. More specifically, OCPs have been acknowledged to deplete vitamin B6, a cofactor for the production of serotonin and GABA, as well as zinc, selenium, phosphorus, and magnesium demonstrated by this cross-sectional randomized study. Interestingly, birth control use was associated with elevated levels of copper (which can upregulate catecholamines, potentially causing feelings of overstimulation), iron (which can be a pro-oxidant), calcium, and cadmium compared to controls. Given that replacing and correcting these vitamins can be an imperfect effort, perhaps it's best not to mess with them in the first place!

The review also discusses that the identification of patients vulnerable to these risks should include assessment of hormone sensitivity (menstrual cycle history, acne/hirsuitism, body mass index), comorbid diagnoses indicative of hormonal disarray (thyroid, diabetes, breast cancer), and baseline hormone assessment. I would add that an assessment of antioxidant and micronutrient status and markers of inflammation would also help to risk stratify.

Can Birth Control Cause Depression?

There is simply no free lunch with medication treatment, and a risk/benefit analysis is very difficult to do if we don't know what environmental and genetic risks an individual is bringing to the table. If there is a treatment option that presents minimal to no appreciable risks and some degree of evidence-based benefit, this, to me would represent the kinder, gentler road to health. These days, women's lib looks a lot more like a healthy, happy menstrual cycle free from the grips of a prescription.

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