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Convex Clinical Research Center was designed and built to address all the needs of the clinical research process. With over 40 experienced clinical investigators our Clinical research center with phase 1 unit offer an excellent approach to early phase research.
Convex phase 1 unit is designed and built to address all the needs of the clinical research process and to ensure quality medical care and safety standards. Open 24/7, it is custom-designed facility and it is focused on pharmacokinetic studies on healthy volunteers.
Our dedicated team of pharmacologists and early phase clinical research team perform phase 1 studies on patient population with a spectrum of diseases. Before each study is initiated we ensure all protocol requirements are followed and Convex Phase 1 unit is in compliance with the appropriate guidelines and regulations.
The Phase 1 unit, centrally located in Sofia city, allowing Convex dedicated staff to progress within the process of recruitment and retention of volunteers and to constantly develop a database of study subjects for multiple types of clinical trials.

33+ Years Experience
250+ Clinical Studies
6400 sq ft Facility
2500+ Volunteers



Phase I is usually the first time a new medical intervention is tried in people. These trials may be offered to healthy volunteers or patients with disease that has not responded to standard treatment.
The number of patients in a phase I trial is usually small – from 10 to 80 – and unlike later phase trials all patients will receive the active intervention. Phase I trials are usually of brief duration – several weeks to a few months – and often take place at specialist hospitals.
To minimize the risk to patients, the dose or setting of the intervention being tested starts very low. The first dose is based on laboratory tests and the effects seen in animals. If none of the patients have any side effects the dose/setting is adjusted for the next patients, who will be given a higher dose.
The dose/setting will continue to be increased until some people do get side effects. When the side effects become unsafe the dose/setting is not increased any further and the clinical trial team knows what the maximum tolerated dose/setting is.




The safety and comfort of our clinical trial participants are of utmost importance. Convex research center provides emergency care specialists as well as specialized emergency medical transportation during treatment period for the save of our participants.
In case of need, the clinical center maintains contract with an university hospital for unhindered and smooth emergency room accommodation and high-quality medical service.
We have created a relaxed and comfortable environment where our study subjects successfully complete their participation and meet new friends and medical professionals they could rely on in future.
Quality is at the core of our operations. We adhere to rigorous standards and protocols, employing the latest technologies and methodologies to guarantee the integrity and reliability of our findings. Our commitment to upholding the highest ethical standards ensures the safety and well-being of the volunteers who participate in our studies.

For more information about our Phase 1 studies and capabilities, please contact us at: info@convex.bg

Before every Phase I trial, there must be a strategy for ensuring that any risk is minimised throughout the trial. Assessment and management of risks should be documented through a risk management plan that considers all aspects of the trial.
Should potential investigators be concerned about the level of risk, the sponsor must give them access to people with responsibility for the relevant pre-clinical work. The sponsor’s physician should liaise with the investigator, and if concerns persist, they should consult an independent adviser.
The PI and unit staff responsible for the care of subjects in FIH clinical trials should always be appropriately qualified and experienced. The PI must meet specific training and experience requirements and understand the intricacies of executing FIH trials.
The investigator must assess the risk of harm by reviewing the protocol, investigator’s brochure, IMP dossier, CTA application and relevant medical literature. They must weigh the foreseeable risks against the expected benefits and explain any risks in the trial documentation.


