U-49900
Limited data
Limited data
Sparse data. Doses and effects may be unreliable or untested.
- 2 corroborating sources
- no dose data
- 19 combo interactions documented
- classified Tentative
- classified Research-chemical
- 2 corroborating sources
- no dose data
- 19 combo interactions documented
- classified Tentative
- classified Research-chemical
Summary
A substance that is an analogue of U-47700, yet doesn't share much with it. If you are interested in trying it, I recommend reading this. https://www.reddit.com/r/researchchemicals/comments/5gbo3e/u49900_experiment_and_warning/.
Effect Profile
Scores (1–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- Weighted by importance: core (×3), major (×2), minor (×1)
Moderate euphoria with mild itching/nausea, low sedation
Tolerance
Tolerance Decay
Acute tolerance: develops within a single session — the reset numbers above apply after sustained heavy use, not after one binge. Within-session tachyphylaxis usually resets largely overnight.
Effects
- Stimulation
- Motor impairment
- Increased heart rate
- Pupil dilation
- Nausea
- Insomnia
- Vasoconstriction
- Restlessness
- Sedation
- Decreased appetite
- Reduced anxiety
- Euphoria
- Cognitive euphoria
- Wakefulness
- Empathy
- Anxiety
- Confusion
- Compulsive redosing
- Time distortion
- Talkativeness
- Increased music appreciation
- Color enhancement
- Tactile enhancement
- Brightened colour
- Light sensitivity
- Appetite suppression
- Dehydration
- Disinhibition
- Dulled perception
- Drifting
Combinations
Cross-Check U-49900 with another substanceHelpful Links
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