Table 3.

Study procedures implemented based on formative research findings.

Study procedure category	Study procedures
Peer navigation	Require peers to have experience working or networking with substance users, particularly people who use methamphetamine Peer works flexible hours Peer role includes working remotely Peer training includes boundary setting
Text messaging	Study sends three messages per day Various adherence reminders are sent Reminder messages are straightforward Participants select two ranges of 2-hour time periods for messages in baseline survey Participants select content area of some messages in baseline survey Participants select the word they want in their adherence reminders in the baseline survey Text message platform has the ability to send emojis
Educational and recruitment materials	Some cards use “PnP” (party and play) Images used do not overtly show methamphetamine or sex Some materials use symbols indicating inclusion of transgender participants
Other study procedures	Participants with a phobia of technology are excluded Some study clinics have evening and weekend hours