Evidence map›Paper›PMID 18058202›Full record

ReviewPharmaceutical research2008

On the rate and extent of drug delivery to the brain.

Margareta Hammarlund-Udenaes, Markus Fridén, Stina Syvänen, Anubha Gupta

Abstract readReview
In one paragraph

Review in Pharmaceutical research, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 209 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
209citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

209 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Model-Based Meta-analysis of Rifampicin Exposure and Mortality in Indonesian Tuberculous Meningitis Trials.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2020
    Pooled it
  2. Pharmacokinetic Analysis of Carboplatin and Fluorescein Brain Retention following Ultrasound-Based Blood-Brain Barrier Opening.Clinical cancer research : an official journal of the American Association for Cancer Research · 2025
    Trial
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  8. International journal of molecular sciences · 2026
    Article
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  16. Comparative analysis of the uptake of the HFluids and barriers of the CNS · 2025
    Article
  17. Is Fentanyl Rebound an Intrinsic Feature of Naloxone Reversal?Pharmaceuticals (Basel, Switzerland) · 2025
    Article
  18. Article
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  20. Asparagine endopeptidase (AEP) inhibitor formulation via zein-based nanoparticle improves the therapeutic efficacy toward Alzheimer's disease.Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics · 2025
    Article

149 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Margareta Hammarlund-UdenaesDivision of Pharmacokinetics and Drug Therapy, Department of Pharmaceutical Biosciences, Uppsala University, P.O. Box 591, 751 24 Uppsala, Sweden. mhu@farmbio.uu.se
Markus Fridén
Stina Syvänen
Anubha Gupta

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

To define and differentiate relevant aspects of blood-brain barrier transport and distribution in order to aid research methodology in brain drug delivery. Pharmacokinetic parameters relative to the rate and extent of brain drug delivery are described and illustrated with relevant data, with special emphasis on the unbound, pharmacologically active drug molecule. Drug delivery to the brain can be comprehensively described using three parameters: Kp,uu (concentration ratio of unbound drug in brain to blood), CLin (permeability clearance into the brain), and Vu,brain (intra-brain distribution). The permeability of the blood-brain barrier is less relevant to drug action within the CNS than the extent of drug delivery, as most drugs are administered on a continuous (repeated) basis. Kp,uu can differ between CNS-active drugs by a factor of up to 150-fold. This range is much smaller than that for log BB ratios (Kp), which can differ by up to at least 2,000-fold, or for BBB permeabilities, which span an even larger range (up to at least 20,000-fold difference). Methods that measure the three parameters Kp,uu, CLin, and Vu,brain can give clinically valuable estimates of brain drug delivery in early drug discovery programmes.

Indexed as

AlgorithmsAnimalsBrainDrug Delivery SystemsHalf-LifeHumansPermeabilityPharmacokinetics

Identifiers

PMID18058202
PMCPMC2469271

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.