For how long do you recommend treatment for latent tuberculosis prior to initiation of anti-TNF therapy?

Some recommendations call for completing a course of treatment for latent TB prior to starting a biologic but I find most patients and referring specialists are intolerant of that strategy. This reference: Yeo et al., European Respiratory Journal 2014 is a good example of data supporting a shorter wait. I try to use rifampin and give a month prior to them starting a biologic, including to make sure the patient is tolerating it and liver enzymes are stable.

Additionally, one should consider the clinical urgency for initiating anti-TNF therapy (Fehily et al., PMID 35596242). When possible, delaying treatment for at least one month is recommended. If there is no clinical urgency, the treatment can be postponed till the completion of therapy. If it is an emergency, concomitant treatment can be considered, and such a recommendation is based on studies that showed a low risk for TB reactivation in patients undergoing bone marrow and solid organ transplantation who were simultaneously started on LTBI and immunosuppressive therapy.

1 month and tolerating latent tuberculosis treatment, usually 3HP-DOT, 3Hr, or 4R.

Agree with all these answers. To provide a source, waiting one month after initiation of latent TB treatment before initiating a biologic or JAK inhibitor is the formal recommendation of the latest ACR RA Treatment Guidelines (Singh et al., PMID 26545825).

I don’t think it’s that straightforward. If it’s a recent LTBI, then the risk of evolving to active TB is much higher as opposed to someone who has been positive for years (like myself who converted after working in a TB hospital in the 1970s). Some may also have positive tests after previously unrecognized PPD. As such a recent converter should have a more aggressive anti-tubercular standard therapy as noted above, especially if there is radiologic evidence of a ‘healed’ infection. Those who have had an LTBI for years are unlikely to reactivate and prophylaxis with INH alone is probably sufficient to start a week or two prior to biologics to ensure tolerance. The duration of INH alone is unclear and should probably finish standard 1 year since biologics are continued indefinitely.

1 month of treatment regardless of regimen.