prof. dr. I.E.C. (Iris) Sommer

psychiatrist

Faculty of Medical Sciences

Telephone:

E-mail:

i.e.c.sommer umcg.nl

Homepage Research Portal

Publications

Absolute neutrophil count and adverse drug reaction monitoring during clozapine treatment: consensus guidelines from a global Delphi panel

Clozapine Delphi Expert Panel, Siskind, D., Northwood, K., Pillinger, T., Chan, S., Correll, C. U., Cotes, R., Every-Palmer, S., Hahn, M., Howes, O., Kane, J. M., Kelly, D., Korman, N., Lappin, J., Mena, C., Myles, N. & McCutcheon, R. A., Jan-2026, In: The Lancet Psychiatry. 13, 1, p. 77 - 86 10 p.

Research output: Contribution to journal › Review article › peer-review

Antipsychotic Medication Preferences: A Large-Scale Survey

Wezenberg, B. N., Bouws, J., Van Der Pluijm, M., De Koning, M. B., Kikkert, M., Blankers, M., Sommer, I. E., Van Dijk, F. A. & De Haan, L., 19-Feb-2026, (E-pub ahead of print) In: Pharmacopsychiatry. 9 p.

Research output: Contribution to journal › Article › Academic › peer-review

Antipsychotic plasma concentration as predictor of movement disorders and cardiometabolic side-effects:: A comparison with prescription dose

HAMLETT and OPHELIA Consortium, Liu, Y., Sommer, I., Schoretsanitis, G., Hamers, I., Scheurink, T., Begemann, M. J. H., Gangadin, S. S., van Beveren, N. J. M., Koops, S. & Bakker, P. R., Apr-2026, In: European Neuropsychopharmacology. 105, 11 p., 112769.

Research output: Contribution to journal › Article › Academic › peer-review

Automated Speech-Based Modeling of Item-Level Symptom Severity in Schizophrenia

Ciampelli, S., De Boer, J. N., Koops, S., Troelstra, E., Jebens, A., Marsman, J. B. C., Smit, A. C., Hossein Nikzad, A., Partlan, R., Homan, P., Hinzen, W., Tang, S. X. & Sommer, I. E. C., 25-Jun-2026, In: Jama network open. 9, 6, 11 p., e2620239.

Research output: Contribution to journal › Article › Academic › peer-review

Beyond the Need for Speed:: D2 Receptor Affinity Predicts Relapse after Antipsychotic Tapering in First Episode Psychosis

Gangadin, S. S., de Beer, F. & Sommer, I. E., May-2026, In: Schizophrenia Bulletin. 52, 3, 3 p., sbaf257.

Research output: Contribution to journal › Editorial › Academic › peer-review

Citalopram serum concentrations in men and women of pre- and post-menopausal age

Bosch, E. L., de Beer, F., Cath, D. C., Gangadin, S. S., Touw, D. J. & Sommer, I. E. C., 2026, In: Expert Opinion on Drug Metabolism & Toxicology. 22, 6, p. 465-470 6 p.

Research output: Contribution to journal › Article › Academic › peer-review

Clinical Practice Guideline on the Choice of First Antipsychotic Medicine for Females Experiencing a First-Episode of Psychosis

Hynes-Ryan, C., Keating, D., Carolan, A., Brand, B., Dazzan, P., Gaughran, F., Hahn, M., Halstead, S., Harrington, S. M., Hartnett, Y., Kelleher, I., Lyne, J., McNicholas, F., O'Connor, K., Perry, B., Sadowska, E., O'Donoghue, B. & Sommer, I. E., Mar-2026, In: Schizophrenia Bulletin. 52, 2, 17 p., sbag023.

Research output: Contribution to journal › Article › Academic › peer-review

Correction: Psychiatrists effect on positive symptom severity and daily functioning during pharmacotherapy for first-episode psychosis patients

HAMLETT OPHELIA Consortium, de Beer, F., Koops, S., Schoevers, R. A., Veling, W., van Beveren, N., de Haan, L., Boonstra, N., Kikkert, M., Begemann, M. J. H., Lokkerbol, J. & Sommer, I., 2026, In: Scientific Reports. 16, 1, 1 p., 3275.

Research output: Contribution to journal › Erratum

De stem van het brein: hoe taal ons maakt tot wie we zijn

Sommer, I., Sept-2026, Uitgeverij Atlas Contact. 224 p.

Research output: Book/Report › Book › Popular

Early Dose Reduction or Discontinuation vs Maintenance Antipsychotics After First Psychotic Episode Remission: A Randomized Clinical Trial

HAMLETT OPHELIA Consortium, Sommer, I. E., de Beer, F., Gangadin, S., de Haan, L., Veling, W., van Beveren, N., Boonstra, N., Rosema, B.-S., van Os, J., Kikkert, M., Koops, S., Noorman, J., Thielen, F., Wijnen, B. & Begemann, M., Jan-2026, In: Jama psychiatry. 83, 1, p. 68-73 6 p.

Research output: Contribution to journal › Article › Academic › peer-review