Abstract: The invention provides a novel nitrogen-containing heterocyclic derivative having 2,6-disubstituted styryl and a pharmaceutically acceptable salt thereof, and a pharmaceutical composition comprising the nitrogen-containing heterocyclic derivative and a pharmaceutically acceptable salt thereof, in particular, a pharmaceutical composition effective as a sodium channel inhibitor, having an excellent analgesic action especially on neuropathic pain with minimized side effects.

Abstract: The piperidine derivative of the present invention in which the 4-position of the piperidine ring is bonded, via vinylene, to a mono-substituted (—R1) or unsubstituted benzene ring and the 1-position of the piperidine ring has an acyl group [—C(?O)—R4], or a pharmaceutically acceptable salt thereof has an excellent sodium channel inhibition action and an excellent analgesic action and shows a high analgesic effect particularly to neurogenic pain.

Abstract: The invention provides a novel nitrogen-containing heterocyclic derivative having 2,6-disubstituted styryl and a pharmaceutically acceptable salt thereof, and a pharmaceutical composition comprising the nitrogen-containing heterocyclic derivative and a pharmaceutically acceptable salt thereof, in particular, a pharmaceutical composition effective as a sodium channel inhibitor, having an excellent analgesic action especially on neuropathic pain with minimized side effects.

Abstract: New therapeutic agents of isoquinuclidine derivatives are represented by the following formula or its hydrochloride salts. ##STR1## (wherein R.sub.1 is hydrogen, carboxyl group, ethoxycarbonyl group, 4-(ethoxycarbonyl)phenyl group, 4-(carboxy)phenyl group, 2-(carboxy)-thiophene-5-yl group, quinoline-5-yl group, 4-(quinoline-5-yl)phenyl group or 4-(3-oxo-2-azabicyclo[2.2.2]octane-2-yl)-phenyl group; R.sub.2 is hydrogen or allyl group; Both X.sub.1 and X.sub.2 are hydrogen and X.sub.1 and X.sub.2 may form an oxo group; m stands for an integer of 0 to 2.) These compounds, have excellent inhibitory activities against squalene synthase, and are useful as a treatment agent for hypercholesterolemia.

Abstract: New therapeutic agents of cycloheptimidazole derivatives are disclosed, which are represented by the following formula or its alkali-addition salts. ##STR1## (wherein R.sub.1 represents H or isopropyl group; R.sub.2 represents a lower alkyl; R.sub.3 represents a carboxylic acid or tetrazole group. A and A.sub.1 are substituted groups at 4 or 8 position and A.sub.1 is a hydrogen or hydroxy group when A is a hydrogen or A and A.sub.1 is an oxo group. The dotted line "- - - -" is two double bonds or saturated single bonds).These compounds are useful as anti-hypertensive or anti-congestive heart failure agents.

Abstract: Derivatives of cyclic guanidine are disclosed, which are represented by the following formula:A--S--Rwherein A is ##STR1## R.sub.1 represent a lower alkyl or substituted phenyl or unsubstituted phenyl group; R.sub.2 is a lower alkyl; R.sub.3 is H or a lower alkyl; R is lower alkyl, alkenyl, alkynyl, alkanoyl, alkenoyl, dialkylaminoalkyl, cyanoalkyl, alkoxycarbonylalkyl, carboxylalkenyl, alkoxycarbonyl, alkoxyalkylcarbonyl, dialkylaminocarbonyl, dialkylaminothiocarbonyl, phenoxyalkylcarbonyl, piperidinoalkyl, pyridine carbonyl, substituted or unsubstituted benzoyl, or substituted or unsubstituted benzyl group. The compounds of the present invention are useful as anti-ulcerative agents.

Abstract: Derivatives of cyclic guanidine are disclosed, which are represented by the following formula:A--S--Rwherein A is ##STR1## R.sub.1 represent a lower alkyl or substituted phenyl or unsubstituted phenyl group; R.sub.2 is a lower alkyl; R.sub.3 is H or a lower alkyl; R is lower alkyl, alkenyl, alkynyl, alkanoyl, alkenoyl, dialkylaminoalkyl, cyanoalkyl, alkoxycarbonylalkyl, carboxylalkenyl, alkoxycarbonyl, alkoxyalkylcarbonyl, dialkylaminocarbonyl, dialkylaminothiocarbonyl, phenoxyalkylcarbonyl, piperidinoalkyl, pyridine carbonyl, substituted or unsubstituted benzoyl, or substituted or unsubstituted benzyl group.The compounds of the present invention are useful as anti-ulcerative agents.