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Dr. Alexander Nazarchuk is a physician specialising in allergology and internal medicine. He provides online consultations for adults, following the principles of evidence-based medicine — no outdated treatments or unnecessary tests, with clear explanations and a personalised approach. He helps patients with a wide range of allergic and therapeutic conditions, from common day-to-day complaints to complex cases involving allergies, gastrointestinal issues, cardiovascular concerns, respiratory symptoms, and more.

You can consult Dr. Nazarchuk for:

• Test interpretation and guidance on diagnostic plans.
• Allergic rhinitis, hay fever, bronchial asthma (including severe cases).
• Food and drug allergies, skin rashes, angioedema.
• Atopic dermatitis, urticaria, contact allergies.
• Allergen-specific immunotherapy (AIT) – initiation and ongoing management.
• Abdominal pain, bloating, changes in bowel habits, nausea, heartburn.
• High blood pressure and adjustment of baseline antihypertensive therapy.
• Hyperlipidaemia and elevated cholesterol.
• Cough, nasal congestion, fever, sore throat.
• Anaemia, including iron deficiency and related conditions.
• Other issues related to allergology and internal medicine.

During consultations, Dr. Nazarchuk takes a thorough, structured approach — analysing symptoms, identifying potential causes, and helping patients make informed decisions. Whether treatment, further investigation, or monitoring is needed, he explains each step clearly so you understand your health and how best to manage it.

Dr Alexandra Alexandrova is a licensed general medicine doctor in Spain, specialising in trichology, nutrition, and aesthetic medicine. She offers online consultations for adults, combining a therapeutic approach with personalised care for hair, scalp, and overall health.

Areas of expertise:

• Hair loss in women and men, postpartum hair loss, androgenetic and telogen effluvium.
• Scalp conditions: seborrheic dermatitis, psoriasis, scalp irritation, dandruff.
• Chronic conditions: hypertension, diabetes, metabolic disorders.
• Online trichology consultation: customised treatment plans, nutritional support, hair growth stimulation.
• Hair loss prevention: hormonal imbalance, stress factors, haircare strategies.
• Routine health check-ups, prevention of cardiovascular and metabolic diseases.
• Personalised nutritional advice to improve hair strength, skin health, and hormonal balance.
• Aesthetic medicine: non-invasive strategies to enhance skin quality, tone, and metabolic wellness.

Dr Alexandrova follows an evidence-based and holistic approach: online consultations with a therapist and trichologist on Oladoctor provide professional support for hair, scalp, and overall health — all from the comfort of your home.

Dr Tomasz Grzelewski is an MD, PhD specialist in allergy, paediatrics, general practice and sports medicine, with a clinical focus on dermatology, endocrinology, allergology and sports-related health. He has more than 20 years of clinical experience and completed his medical training at the Medical University of Łódź, where he defended his PhD thesis with distinction. His doctoral research was recognised by the Polish Society of Allergology for its innovative contribution to the field. Throughout his career, he has gained extensive expertise in diagnosing and managing a wide range of allergic and paediatric conditions, including modern allergen desensitisation techniques. For five years, Dr Grzelewski served as the Head of two paediatric departments in Poland, managing complex clinical cases and leading multidisciplinary teams. He also worked in medical centres in the United Kingdom, gaining experience across both primary care and specialist environments. With over a decade of telemedicine experience, he has provided online consultations across Europe and is valued for his clear, structured and evidence-based medical guidance. Dr Grzelewski is actively involved in clinical programmes focused on modern anti-allergic therapies. As a Principal Investigator, he leads research projects on sublingual and oral allergen desensitisation, supporting evidence-based progress in allergy treatment for both children and adults. In addition to his background in allergology and paediatrics, he completed dermatology studies through the Cambridge Education Group (Royal College of Physicians of Ireland) and a Clinical Endocrinology course at Harvard Medical School. This advanced training enhances his ability to manage skin manifestations of allergies, atopic conditions, urticaria, endocrine-related symptoms and complex immunological reactions. Patients commonly seek his care for: 

• seasonal and perennial allergies
• allergic rhinitis and chronic nasal symptoms
• asthma and breathing difficulties
• food and medication allergies
• urticaria, atopic dermatitis and skin reactions
• recurrent infections in children
• sports-related health questions
• general family medicine concerns

Dr Tomasz Grzelewski is known for his clear communication style, structured medical approach and ability to explain treatment options in a concise and accessible way. His multidisciplinary background across allergy, paediatrics, dermatology and endocrinology allows him to provide safe, up-to-date and comprehensive care for patients of all ages.

Dr. Pawel Danko is a physician and specialist in Internal Medicine, as well as a graduate of the Jagiellonian University Medical College in Krakow.

He gained extensive clinical experience at the 5th Military Clinical Hospital with Polyclinic in Krakow, the District Hospital in Chrzanów (Department of Gastroenterology), and the Hospital of the Ministry of Internal Affairs and Administration in Krakow, where he worked in the Department of Internal Medicine and Geriatrics. He has also practiced in Primary Healthcare and in an Internal Medicine Clinic.

Currently, Dr. Danko works at the Voivodeship Eye Hospital in Krakow, where he is responsible for qualifying patients for ophthalmological surgery.

His work with patients requiring multidisciplinary and intensive medical care has enabled him to develop a comprehensive approach to patient assessment and a deep understanding of the connections between seemingly unrelated medical conditions. He has particular experience in the diagnosis and treatment of gastroenterological and cardiological diseases.

In his clinical practice, Dr. Danko focuses on optimizing treatment plans - aiming to use the minimum necessary number of medications in order to reduce the risk of adverse drug interactions. He continually updates his medical knowledge and remains committed to providing the highest standard of care to his patients.

Dr Marta Reguero Capilla is an allergist and immunologist who works with both adults and children. She specialises in the diagnosis, treatment, and ongoing management of allergic and immune-related conditions through online consultations. In her practice, Dr Reguero Capilla helps patients understand the causes of their symptoms, review test results, and choose appropriate treatment or monitoring strategies. Her consultations are suitable both for first-time assessments and for follow-up care over time. Patients commonly consult Dr Marta Reguero Capilla for: 

• allergic rhinitis, seasonal allergies, and perennial allergy symptoms;
• allergic conditions in adults and children;
• bronchial asthma and allergy-related respiratory symptoms;
• urticaria (acute and chronic) and angioedema;
• food allergies and reactions to foods, additives, or medications;
• atopic dermatitis, allergic rashes, and persistent itching;
• unexplained or recurrent allergic reactions;
• interpretation of laboratory tests, allergy testing, and immunology results;
• immune system concerns, frequent infections, and reduced immune response;
• ongoing medical follow-up and treatment adjustment.

Dr Reguero Capilla works in a structured and attentive manner, explaining medical decisions clearly and helping patients make informed choices about their own health or their child’s care. When clinically appropriate, she may provide recommendations for further tests or referrals that patients can use within Spanish medical networks, including Sanitas and DKV, in accordance with the terms and conditions of those services.