# Drug-drug Interaction Study of CTP-543 and Oral Contraceptives in Healthy Female Subjects

> **NCT04309643** · PHASE1 · COMPLETED · sponsor: **Concert Pharmaceuticals** · enrollment: 21 (actual)

## Conditions studied

- Healthy Volunteers

## Interventions

- **DRUG:** CTP-543
- **DRUG:** Combined oral contraceptive containing Ethinyl estradiol (EE) and Levonorgestrel (LNG)

## Key facts

- **NCT ID:** NCT04309643
- **Lead sponsor:** Concert Pharmaceuticals
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE1
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2020-06-09
- **Primary completion:** 2020-06-25
- **Final completion:** 2020-07-08
- **Target enrollment:** 21 (ACTUAL)
- **Last updated:** 2020-07-16

## Collaborators

- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04309643

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04309643, "Drug-drug Interaction Study of CTP-543 and Oral Contraceptives in Healthy Female Subjects". Retrieved via AI Analytics 2026-06-01 from https://api.ai-analytics.org/clinical/NCT04309643. Licensed CC0.

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