What is the approximate lifespan of T cells, which is important for understanding the timeline of Restasis results?

The approximate lifespan of T cells, particularly memory T cells, is around 90 days. This is significant when discussing the timeframe for results from Restasis (cyclosporine ophthalmic emulsion), which is used to treat dry eye disease by increasing tear production. Understanding the lifespan of T cells is critical because their activation and proliferation are part of the immune response that Restasis aims to modulate.

When Restasis is administered, it may take time for T cells to respond to the treatment, leading to a gradual increase in tear production. The 90-day lifespan reflects the time it typically takes for the immune modulation effects of the drug to become noticeable, as the drug acts on these immune cells. This timeframe is essential for clinicians to relay to patients, managing their expectations regarding the onset of the therapeutic effects of the medication.