Lysergic acid

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 2017-11-21 to 2017-12-28

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Version / remarks:

2001

Deviations:

no

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

Lysergic acid

EC Number:

201-431-9

EC Name:

Lysergic acid

Cas Number:

82-58-6

Molecular formula:

C16H16N2O2

IUPAC Name:

(8β)-6-methyl-9,10-didehydroergoline-8-carboxylic acid

Specific details on test material used for the study:

Batch: 17019FS4B4
Purity: 94.4%

Test animals

Species:

rat

Strain:

other: Crl: WI(Han)

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Deutschland, Sulzfeld, Germany
- Females nulliparous and non-pregnant: yes
- Age at study initiation: Young adult animals (approximately 8-9 weeks old)
- Weight at study initiation: 138 to 176 g
- Housing: On arrival and following assignment to the study, animals were group housed (up to 3 animals of the same sex and same dosing group together) in polycarbonate cages containing sterilized sawdust as bedding material equipped with water bottles. Separated during designated procedures/activities
- Diet: ad libitum pelleted rodent diet, except during designated procedures
- Water: Municipal tap-water was freely available to each animal via water bottles.
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18°C to 24°C (Target), 20 to 21 °C (Actual)
- Humidity (%): 40% to 70% (Target), 43 to 51% (Actual)
- Air changes (per hr): Ten or greater
- Photoperiod (hrs dark / hrs light): A 12-hour light/12-hour dark cycle

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

corn oil

Details on oral exposure:

VEHICLE
- Amount of vehicle: 10 mL/kg body weight
- Justification for choice of vehicle: Trial preparations were performed at the Test Facility to select the suitable vehicle and to establish a suitable formulation procedure.

CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: The dose levels were based on the OECD test guidelines and were selected from the series 5 (lowest dose level), 50, 300 and 2000 (highest dose level) mg/kg body weight. The starting dose level should be the one that is likely to produce mortality in at least some of the animals and was selected based on available toxicity data of the test item.

Doses:

300, 2000 mg/kg body weight

No. of animals per sex per dose:

Each dose group consisted of 3 animals.

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing:general health/mortality and moribundity: twice daily. Body Weights: on Day 1 (predose), 8 and 15. Clinical observation: postdose observations were performed at periodic intervals on the day of dosing (at least three times) and once daily thereafter.
- Necropsy of survivors performed: yes, at the end of observation period, all animals were sacrificed by oxygen/carbon dioxide procedure and subjected to necropsy.

Results and discussion

Effect levels

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality occurred.

Clinical signs:

other: Hunched posture and piloerection was noted for all animals between on Days 1 and/or 2. Additionally, uncoordinated movements and/or chromodacryorrhoea of the snout was noted for three animals treated at 300 mg/kg on Day 1.

Gross pathology:

No abnormalities were found at macroscopic post mortem examination of the animals.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The oral LD50 value of test item in Wistar rats was established to exceed 2000 mg/kg body weight. The LD50 cut-off value was considered to exceed 5000 mg/kg body weight.

Executive summary:

The study was carried out in compliance with the guideline OECD No.423 (2001) "Acute Oral Toxicity, Acute Toxic Class Method".

Initially, Lysergic acid was administered by oral gavage to three female Wistar rats at 300 mg/kg body weight. In a stepwise procedure three additional groups of three females were dosed at 300, 2000 and 2000 mg/kg body weight. All animals were subjected to daily observations and weekly determination of body weight. Macroscopic examination was performed after terminal sacrifice (Day 15). 

The oral LD50 value of test item in Wistar rats was established to exceed 2000 mg/kg body weight. The LD50 cut-off value was considered to exceed 5000 mg/kg body weight.