Lithium vs. Antipsychotics: Re-evaluating the Gold Standard for Bipolar Disorder

The podcast discusses the historical trajectory of lithium as a treatment for bipolar disorder, from its discovery by John Cade in the late 1940s as a "game changer" and "gold standard" to its gradual decline in usage with the advent of second-generation antipsychotics in the 1990s. Dr. Marks explores the reasons behind this shift, primarily focusing on the perceived ease of use and faster action of antipsychotics compared to lithium's demanding monitoring requirements and slower onset. A key distinction is drawn between lithium's mechanism of action, which addresses a "root cause" by correcting altered ion transport mechanisms at the cellular level (blocking sodium entry), and antipsychotics, which work "downstream" by affecting neurotransmitter chemicals. The podcast highlights lithium's narrow therapeutic window, necessitating regular blood tests and careful hydration, contrasting with antipsychotics that do not require blood level monitoring. Side effects also differ, with lithium posing risks to thyroid and kidney function long-term, while antipsychotics are associated with significant weight gain and metabolic issues. Dr. Marks emphasizes the importance of regular monitoring for lithium users, including blood tests for lithium levels, kidney, and thyroid function. She advises starting with split dosing to mitigate initial nausea and then switching to bedtime dosing to reduce kidney strain. For newly diagnosed individuals, lithium is presented as a strong candidate, particularly for preventing episodes early in the illness. However, it's noted that lithium may not be suitable for everyone, especially those with mixed episodes or substance use disorder. The podcast advocates for a re-evaluation of lithium, citing its unique benefits beyond mood stabilization, such as its anti-suicidal properties, ability to stabilize the body clock by affecting circadian genes, and anti-aging effects through telomere lengthening. It also improves brain health by reducing brain shrinkage. These broader implications suggest that lithium offers a more holistic and fundamental correction to underlying biological issues in bipolar disorder compared to the symptomatic relief offered by antipsychotics, positioning it as a potentially underappreciated hero deserving of renewed consideration.

A game changer in the late 1940s, lithium revolutionized the treatment of bipolar disorder, offering a beacon of hope for millions of people.

It has a narrow therapeutic window, which means that the range between the dose of the drug that is effective or works to treat your symptoms and the dose that could be harmful or toxic is quite small.

If you have any big shifts in your fluid balance, like from vomiting or diarrhea or heavy sweating, you have to look out for signs of toxicity.

A 2023 study by Joseph and colleagues found that a third of people in their study on long-term lithium treatment developed thyroid disorder.

If you're manic and in the process of clearing out your bank account to build a rocket ship or making plans to sleep with your boss's spouse, you don't want to wait four to six weeks for the lithium to take effect.

Unlike antipsychotics, lithium actually addresses one of the root causes of bipolar disorder.

An analogy would be, if you have a bleeding wound, lithium sews up the wound and the antipsychotics are the gauze and bandaging that keeps the wound from seeping.

Researchers have seen that people with bipolar disorder taking lithium had longer telomeres than people with and without bipolar disorder who had not taken lithium.

Lithium is particularly good at keeping episodes away at the beginning of your illness, but lithium isn't good for everyone.

Although lithium does have side effects that include cognitive slowing and loss of creativity, it does not cause the weight gain and metabolic issues that the antipsychotics do.