I survived a PIP at work after getting diagnosed with ADHD and taking medication

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This as-told-to essay is based on a conversation with a woman based in the US who works in digital marketing. She was put on a performance-improvement plan several months into a new job. She'd been fired from a prior role and didn't expect to survive the PIP. However, diagnosis and treatment for attention-deficit/hyperactivity disorder helped improve her focus. She asked that Business Insider withhold her identity because she didn't want her story to reflect poorly on her employer's training process. The following has been edited for brevity and clarity.