HDMP-28
Methylnaphthidate
Images
Quick reference
Duration
Experience
Primary effects
- A stimulant producing an intense, strong, and long-lasting 'buzz'.
- Causes pupil dilation and jaw tension.
Peak character
- The experience was 'nice enough' but accompanied by a high body load.
Negatives / side effects
- Significant nose-burn and harshness if insufflated, potentially leading to a mild headache.
- Causes high jaw tension and potential for compulsive redosing.
- Can lead to a lengthy period of residual stimulation and inability to sleep if too much is taken.
Aftereffects / comedown
- Residual stimulation can last into the following late-afternoon if taken in the evening, causing sleep deprivation.
- May contribute to a general feeling of malaise after the experience.
Reference dosage
Reference ranges from third-party harm-reduction databases. Individual response varies enormously — start lower than you think.
| threshold | 5mg+ |
| light | 10mg+ |
| common | 20mg+ |
| strong | 40mg+ |
Reagent testing
| Mandelin | Yellow → orange |
| Marquis | Orange/brown |
Adulterant detection: Hydroxymethylphenidate analogue. High potency; limited specific reagent data.
Methylphenidate-class stimulant. Higher potency than MPH — precise dosing essential.
Source
Reference fields and narrative for HDMP-28 extracted from The Drug Users Bible by Dominic Milton Trott (MxZero Publishing, 2022).
drugusersbible.comHarm reduction notice
This platform provides educational and harm-reduction information adapted from public reference material. It does not endorse, encourage, or facilitate drug use. It is not medical advice. If you or someone near you may be in a medical emergency, contact local emergency services immediately.