1-186 /PHOSPHODIESTERASE INHIBITORS PDR FOR HERBAL MEDICINESPHOSPHODIESTERASE INHIBITORS
Digitalis
(Increases risk of cardiac
arrhythmias)
Digitalis Lanata
(Risk of cardiac arrhythmias)
Indian Squill
(Can increase the risk of cardie
arrhythmias when given
simultaneously with this herb)
Squill
(Increases risk of cardiac
arrhythmias)
PHOTOSENSITIZING AGENTS
St. John's Wort
(An additive photosensitizing
effect is expected when the herb
is used with photosensitizing
drugs such as tetracyclines,
sulfonamides, and thiazides)
PLANTAGO AFRA
(See under Psyllium Seed)
PLANTAGO OVATA
(See under Psyllium)
PROCAINAMIDE
Henbane
(Increased anticholinergic action)
PSYLLIUM
Drugs, unspecified
(Absorption of other drugs may
be decreased if taken
simultaneously with herb)
Insulin
(Effect unspecified; insulin dose
should be decreased)
PSYLLIUM SEED
Drugs, unspecified
(Absorption of other drugs may
be decreased if taken
simultaneously with herb)
QUERCUS ROBUR
(See under Oak)
QUINIDINE
Adonis
(Increases action of Adonis)
Belladonna
(Increases anticholinergic effect of
herb)
Digitalis
(Increases risk of cardiac
arrhythmias)
Digitalis Lanata
(Risk of cardiac arrhythmias)
Henbane
(Increased anticholinergic action)
Indian Squill
(Can increase the risk of cardie
arrhythmias when given
simultaneously with this herb)
Kombe Seed
(Increases effects and side effects
of herb)
Lily-of-the-Valley
(Increases the effect of Lily-of-
the-Valley)
Oleander
(Increased efficacy and side
effects when given simultaneously
with herb)
Scopolia
(Increased effect when given
simultaneously with herb)
Squill
(Increases risk of cardiac
arrhythmias; increases
effectiveness and side effects of
herb)
Strophanthus
(Simultaneous administration with
herb enhance both effects and side
effects)
Strophanthus Gratus
(Simultaneous administration with
herb enhance both effects and side
effects)
QUININE
Drugs that Cause Thrombocytopenia
(Herb increases risk of
thrombocytopenia)
RAUWOLFIA
Alcohol
(Increases impairment of motor
skills)
Barbiturates
(Synergistic effect)
Digitalis Glycoside Preparations
(Severe bradycardia when used in
combination with digitalis
glycosides)Levodopa
(Decreased effect; increases in
extra-pyramidal symptoms)
Neuroleptics
(Synergistic effect)
Sympathomimetic Agents
(Increases blood pressure)
RAUWOLFIA SERPENTINA
(See under Rauwolfia)
RESERPINE
St. John's Wort
(Hypericum antagonizes the effect
of reserpine)
RHAMNUS CATHARTICUS
(See under Buckthorn)
RHAMNUS FRANGULA
(See under Frangula)
RHAMNUS PURSHIANA
(See under Cascara Sagrada)
RHEUM PALMA TUM
(See under Chinese Rhubarb)
RICINUS COMMUNIS
(See under Castor Oil Plant)
SACCHAROMYCES CEREVISIAE
(See under Brewer's Yeast)
SALICYLATES
Bilberry
(Increases prothrombin time;
caution should be observed when
used concurrently)
White Willow
(Use with caution; effect not
specified)
SALIX SPECIES
(See under White Willow)
SALURETICS
Adonis
(Increases action of Adonis)
Lily-of-the-Valley
(Increases the effect of Lily-of-
the-Valley)
Oleander
(Increased efficacy and side
effects when given simultaneously
with herb)
Squill
(Increases effectiveness and side
effects of herb)