A Cannabis-Derived Water-Soluble Preparation Lowered Eye Pressure in Rabbits but Not Monkeys
A 1981 study found that a water-soluble cannabis-derived preparation lowered intraocular pressure after intravenous administration in rabbits but not rhesus monkeys. Other routes did not reproduce that result, sharply limiting clinical interpretation.
The preparation was not identified as purified THC
Researchers tested isolated water-soluble material from Cannabis sativa. The abstract does not establish that it was equivalent to THC, CBD or a modern extract. Intravenous exposure reduced eye pressure in albino and pigmented rabbits, while monkeys showed no corresponding response.
Dose and route changed the pattern
Higher amounts produced an initial pressure increase before the decrease, and repeated daily injections produced tachyphylaxis. Topical, gastric and suppository conditions did not provide the same pressure-lowering response. A favorable result through one laboratory route therefore did not establish a practical eye medication.
Systemic and ocular responses were distinct
The study also examined systemic blood pressure, ocular fluid turnover and pharmacological blockers. Different interventions affected the initial pressure-rise phase and later pressure-lowering phase differently. These observations do not establish one mechanism accounting for every effect of the preparation.
The study illustrates why preparation identity, species and administration route must accompany a cannabis-related eye-pressure claim. It does not demonstrate treatment of human glaucoma or provide a safe product recommendation. A transient pressure change is also not evidence of preserved vision or long-term disease control.
Related: interpreting cannabis tolerance claims.
Research cited
Green K; Zalkow LH; Deutsch HM; Yablonski ME; Oliver N; Symonds CM; Elijah RD. Ocular and systemic responses to water soluble material derived from Cannabis sativa (marihuana). Current eye research (1981). doi:10.3109/02713688109001729. Findings discussed from the study abstract.
