Methylnaphthidate
Aliases: Hdmp-28, Methylnapthidate, methylnaphtidate
Categories
Summary
Methylnaphthidate is a research chemical with very little data on its pharmacological properties, metabolism, and toxicity. It has a limited history of human use and appeared on the research chemical market around 2014. Unlike typical methylphenidate analogs, it displays notable serotonin reuptake inhibition, giving it subjective effects more similar to cocaine or amphetamine. Use precise weighing equipment and start with low doses. Some users report nasal irritation and throat discomfort when insufflated.
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral | 10-15mg | 15-30mg | 30-50mg | 50mg+ |
| Insufflated | 4-8mg | 8-14mg | 14-28mg | 28mg+ |
Light
Common
Strong
Heavy
Onset, Duration & After-effects
| ROA | Onset | Peak | Offset | After Effects | Total |
|---|---|---|---|---|---|
| Oral | 1-10 min | 1.5-2 hrs | 1.5-2 hrs | 1-8 hrs | 120-0 min |
| Insufflated | 1-5 min | 60-90 min | 1-2 hrs | 1-6 hrs | 120-0 min |
Tolerance
Build-up
develops over days to weeks of regular use
Reset
3–7 days for acute tolerance; longer for full reset
Effects
Positive
- Stimulation
Negative
- Increased Heart Rate
- Teeth Grinding
- Increased heart rate
- Vasoconstriction
- Teeth grinding
- Pupil dilation
- Increased blood pressure
- Abnormal heartbeat
- Spontaneous bodily sensations
Positive
- Focus Enhancement
- Motivation Enhancement
- Euphoria
- Analysis Enhancement
- Wakefulness
Negative
- Anxiety
- Cognitive Fatigue
- Depression
- Irritability
- Thought Acceleration
- Time Distortion
Positive
- Increased Music Appreciation
- Increased music appreciation
- Increased libido
Negative
- Appetite Suppression
- Dehydration
- Light sensitivity
- Appetite suppression
- Double vision
- Increased sexuality
- Visual and auditory hallucinations